Archive case record

65_HS1-834228961_62-HQ-83894_Serial_164

Source: uap_archive
Record updated: 2026-08-19

Record summary

The FBI's 62-HQ-83894 case file includes investigative records, eyewitness testimonies, and public reports concerning Unidentified Flying Objects and flying discs documented between June 1947 and July 1968. The records include high-profile incident accounts, photographic evidence from sites like Oak Ridge, TN, and technical proposals regarding potential propulsion systems. Additional topics include convention programs, researcher accounts, and extensive media coverage from the period. This file is partially posted on FBI vault with more redactions and some pages missing. Included here is the complete case file with several newly declassified pages and only minor redactions.

Published source text

Read the available text below. Archive transcriptions may contain OCR errors; later context is labelled separately. A recorded claim is not a finding that it happened.

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1 11 I I I . ' ' 62- IHC-83894 I Serials EBF 154 ~ ~ 1111 I11111 IH~ llm EBF t 62-HCl-83894-ESF" 164 DO NOT· DES.fRO)' •• ~ U l t7{iJ;; +• _ FBI - CENTRAL RECORDS CENTER _ _ . HQ - HEADQUARTERS . Class / Case # Sub Vol. Serial # 0062 83694 1 164 ONLY 8/11/1274166 I 11 1/IIIHIIMIIIIIIIIIIIIlllllllllll~IIIIII RRPO031XG8

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RESTRICTED r DEPARTMENT OF THE AIR FORCE HEADQUARTERS UN1TED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional ai rcraft and unidentified flying objects, including the so- called "Flying Discs ." b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded . 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able , should be dispatched by means of electrical transmission immedia tely afte:' sighttngs. (2) Supplementary reports should be forwarded as availab l e by the most expeditious means consistent with the importance of the information reported . b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Dir ector of Intelli gence, Headquarters United States Air Force . Cables will contain the phase, " Pass to COMGENAMC WRIGHT -PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO - 3." RESTRICTED C9-~89 2, AF

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.. RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the d~velop ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otqer than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton , Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock) . 3. Where sighted (observer 's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection , etc. (3) From building (story), yard, etc . (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer 's aircraft. (4) Latitude and longitude.' c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city , country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape . (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating , fluttering, evasive, aggressive, erratic, etc . 11. Evidence of exhaust. a. Color of smoke. , b . Length and width. RESTRICTED - 3 -

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• RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds . b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c . Blinked on and off in r elation to speed . 14. Support a. Wings. b. Aerodynamic list of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (ball oon or dirigible). 15. Propulsion . a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating ) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability . a . Fins b. Stabilizers (hor izontal or vertical). (1) Size. (2) Shape . (3) Location. - 4 - RESTRICTED

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, .. ,,. ... .. RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P .H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent . 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view . c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer , etc. b. Length of time engaged in hobby (experience). 6. AbUity to determine: a. Color . b. Speed of moving objects. c . Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5 -

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.• '' RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records . (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees . b. Occupation. C. Reliability. 10. Comments of interrogator regarding the intell1gence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc . and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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,. ' RESTRICTED • 3. Local flight schedules of commercial, private and military aircraft flying in vic!nity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. Jf object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. Jf object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radi oactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (ii this happened). d. Maneuvers. e. Formation ii objects were more than two. 8. Secure signed statement . 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentlons that might presum ably be construed as such). c>:1-?~ C. P . CABELL Major General, USAF Director of Intelligence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Direct or, Federal Bureau of Investigation RESTRICTED - 7 -

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• RESTRICTED RESTRICTED

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purp ose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs ." b. To establlsh procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and lett er, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, ar e herewith superseded . 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings . (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports wlll be transmitted to the Director of Intelll gence, Headquarters United State:s Air Force . Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3." RESTRICTED ~a- 8 ~t-9 ~-/t'1/

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RESTRICTED (2) Supplementary written reports , prepared on AF Form 112, will be forwarded to the Director of Intelligence , Headquarters United States Air Force. (3) Commanding General , Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on thl.s subject. c. Major Air Commands (ZI) (1) Reports wlll be forwarded direct to the Commandi ng General, Al.r Materiel Command, Wright-Patterson Al.r Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations rece iv ing lnformation pertaining to the requ iremen ts enunciated in Part II. (2) Copies of such r eports may be supplied the Comma nd Headquarters of the installati on concerned. (3) A copy of all r eports sent to Air Materiel Command in acco rdance with these instruc tions wlll be forwarded at the same ti.me to the Direc tor of Intelligence, Headquarters United States Air Force. (4) Writt en r eports will be submitted on AF Form 112. (5) Commanding General, Air Mate riel Command is authorized direct contact with major Air Commands (ZI) and organizations under thel.r control in connection wl.th the develop ment of informatio n on this subject. d. Non-Air Force Agencies (1) Addressees otQer than those of the United States Air Force are r equested to forward r eports direct to the Commanding General, Al.r Materiel Command, Wright- Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to r educe the ti.me factor involved in transmissi on of this type of information it is r equested that , wher ever communica tions facilities permit, subordinate elements be authorized to communicate reports dir ect to the Commanding General, Air Materiel Com mand. PART Il - REQUIREMENTS General 1. Date of sighting . 2. Time o f sighting (zonal by 24 hr . clock). 3. Where sighted (observ er's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) Fr om building (story), yard, etc. (4) Map coordinates (lf feasible) showing latitude and longitude. - 2 - RESTRICTED

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RESTRIC:t'ED b. Air (1) Type aircraft, speed, altltude, direction of flight. (2) Distance and direction from city , town or known landmark. (3) Clock position of object from observe r's aircraft. (4) Latitude and longitude . c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city , country, etc .) 4. Number of objects . Formation type (l.f any), sketch l.f possible. 5. Observable celestial phenomena or planets that may account for the slghtlng. (Local fac111t!.es or organiz ations which follow such celestial phenomena should be consulted for such information .) 6. Distance of object from observe r. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a . Color. b. Shape. (Sketch ti possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size . (2) Size as Lt appeared from observer's view. (Compared to known object) Q. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osctllatlng, fluttering, evasive , aggressive, erratic, etc. 11. Evidence of exhaust . a. Color of smoke. , b. Length and width. RESTRICTED - 3 -

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RESTRICTED c. Odor (if any). d. Rate of evaporatlon. e. Does trail vary with sound? (spur ts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. c. Reflected on cloud . d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in r elati on to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. c . Vertical jet. d. Rotating cylinde r or cone. e . Aerostatic lift (balloon or dirig ible). 15. Propulsion . a. Propeller or j et . b. Rotor . c . Aerodynamlc vanes (flapping or osclllating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control artd stability. a . Fins b. Stablll.zers (hor izontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRIC T ED

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RESTRICTED 17. Al.r ducts. a. Slots. b. Duct openings . 18. Speed - M .P.H. 19. Sound. a. Continuous wblne or buzz . b. Roar, whistl e, whoosh. c . Interml.ttent. 20. Manner of disappearance. a. Explode. (1) Possl.bill.ty of fragments. (2) Other physl.cal evldence. b. Faded from vlew. c. Disap pear ed b ehlnd o bstacle. Relative to the Observe r 1. Name o f observer. 2. Addr ess . 3. Occupation. 4. Place of busine ss. a. Employer or employee. 5. Pertinent hobbles. a. Is observer amateur astronomer, pllot, engineer, etc. b. Length of time e ngaged in hobby (experience). 6. Abllity to determine: a. Color . b. Speed of movl.ng objects . c. Size at distance. ? . ReUabll1ty of observ er. a. Sources. REST RICTED - 5 -

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RESTRICTED (1) Neighbors . (2) Police Dept. (3) FBI records . (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of llght. c. Degree of fatigue and duratlon of flight at time of sighting in cases where observer ls airborne. 9. Witness es. a . Addressees. b. Occupation. c. Reliabllity. 10. Comments of interr ogator regarding the intelligence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on gr ound. a . Observations of range, speed, altitude and size of target. b. Did targ et executive any turns? If so, what angle (180°), etc. and what radius of t urn. If radius of turn 1s not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Wer e there any radar inductions or extra noise on radi o circuits? b. Give estima tes of size, speed, maneuv ers, etc . GENERAL 1. Teletype sequences of local weather condltl.ons. 2. Winds aloft r eport. - 6 - RESTRICTED

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RESTRICTED 3. Local fUght schedules of commercial, private and m1litary aircraft flying in vicinity at the time. (Check Canadian activ1ty 1f close to that border.) 4. Possible releases of testing devices ln vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 6. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of sons. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b . Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radi o antenna to be observed, 1.e., (any projections or extentions that might presum ably be construed as such). c>: t-!~ C. P. CABELL Major General, USAF Director of Intelligence, Offlce of Deputy Chtef of Staff, Operations DISTRlBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Spec ial Assistant for Research and Intelllgence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director I Federal Bur eau of Investigation RESTRICTED - 7 -

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RESTRICTED RESTRICTED

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RESTRICTED DEPARTMENI' OF THE Affi. FORCE HEADQUARTERS UNITED STATES Am FORCE DmECTORATE OF INI'ELLIGENCE WASHINGTON 25, D. C. 15 February 1949 Am INTELLIGENCE REQUIBEMENI'S MEMORANDUM NUMBER 4 UNCONVENTIONAL Arn.CRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum ls twofold; a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraf t and un1dent1f1ed flying objects, including the so-called "Flying Discs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1 , dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be proc ur able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditlous means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intem gence, Headquarters United State:s Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN : MCIAX0-3." RESTRICTED

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RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, wlll be forwarded to the Director of Intelllgence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Al.r Commands (overseas) and organizations under their control in connection with the development of information on this subjec t. c. Major Air Commands (Zl) (1) Reports will be forwarded direct to the Commanding General , Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by l.nstallations receiv ing information pertaining to the requirements enunciated in Part TI. (2) Copies of such reports may be supplied the Command Headquarters of the installati on conce rned. (3) A copy of all reports sent t o Air Materiel Command in accordan ce with these instruc tions will be forwarded at the same time to the D lrector of Intelligence, Headquarters United States Air Force . (4) Written r eports wlll be subm itted on AF Form 112. (5) Commanding General, Al.r Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop ment of information on this subjec t. d. Non-Air Force Agencies (1) Addressees otQer than those of the United states Air Force are r equest ed to forward reports direct to the Commanding General, Air Materiel Command, Wright - Patter son Air Force Base , Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in tran smissi on of this type o f information it ts r equested that, wher ever communications facillties permit, subordinate eleme nts be authorized t o communicate r eports direct to the Commanding General, Air Materiel Com mand. PART II - REQUIREMENTS Genera l 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Wher e sighted (observer' s position) : a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc . (3) From building (story), yard, etc . (4) Map coordinates (if feasible) showing latitude and l~ngitude. - 2 - RESTRICTED

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observe r's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or orga nizations which follow such celestial phenomena should be consulted for such inform ation.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of eleva tion from horizon. c. Altitude . 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer 's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osclllating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke . , b. Length and width. RESTRICTED - 3 -•

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RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists . c. Reflected on cloud. d. Showed thru cloud. 13, Lights. a. Reflected or attached. b. Luminous c. Blinked on and off Ln r elation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage . c. Vertical jet. d. Rotating cylinder or cone. e. Aer ostatic lift (balloon or dir igible) . 15. Propulsion. a . Pr opeller or jet. b. Rotor. c . Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect) . d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. StabiUzers (hor izontal or vertical). (1) Size. (2) Shape . (3) Location . - 4 - RESTRICTED

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RESTRICTED 17. Alr ducts. a. Slots. b. Duct openlngs. 18. Speed - M.P.H. 19. Sound. a. Continuous whlne or buzz. b. Roar, whlstle, wl;loosh. c. Intermittent . 20. Manner of disappearance. a. Explode. (1) PosslbHlty of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer . 2. Address. 3. Occupation . 4. Place of business . a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot , engineer, etc. b. Length of time engaged ln hobby (experience). 6. Ablllty to determine: a . Color . b. Speed of moving objects . c. Size at distance. 7. Rell.abllity of observer. a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records . (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to ob1ect(s). (1) Sound. (2) Motion. (3) Glint of light, c. Degree of fatigue and duration of :flight at time of sighting in cases where observer is airborne . 9. Witnesses. a. Addressees. b. Occupation . c. Reliability. 10. Comments of interrogator regarding the intelHgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observatlons of range, speed, altitude and size of target. b. Did target executive any turns? If so, what arlgle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay 1n the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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.. RESTR I CTED 3, Local flight schedules of commercial, private and m111tary aircraft flying in vicinity at the time. {Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Alr Force, Army, Weather Units, Research Organizations or any other. 6. If object contacted earth, obtain sou samples within and without depression or spot where object landed {and then presumably departed) for purpose of making comparison of sol.ls. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc . 7. Obtain photographs {or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, l..e., {any projections or extentlons that mlght presum ably be construed as such). cl?~ C. P. CABELL Major General, USAF Director of Intelligence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Dir ecto r of Central Intelligence Spec ial Assistant for Research and IntelUgence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investlgatlon RESTRIC TED - 7 -

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RESTRICTED DEPARTMENT OF THE Affi FORCE HEADQUARTERS UNITED STATES AIR FORCE DlRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 16 Febr uary 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AJRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects , including the so-called "Flying Discs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transfe r red to Air Force agencies for action, ar e herewith superseded . 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings . (2) Supplementary r eports should be forwarded as available by the most expeditious means consistent with the importance of the information reported . b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports wlll be transmitted to the Dir ector of Intelli gence, Headquarters United State:s Air Force. Cables will contain the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3." RESTRICTED C9-H92 , AF

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RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelll.gence, Headquarter s Unlted States Alr Force . (3) Commandlng General, Air Materiel Command is authorized direct contact with major Alr Commands (overseas) and or ganizations under thelr contr ol in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forward ed dlrect to the Commanding Genera l, Air Mate riel Command, Wright-Patter son Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installatlons r ece iv ing information pertaining to the requir ements enunciated ln P art II. (2) Coples of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all rep orts sent to Air Materiel Command in accordance with these instruc tions will be forwarded at the same time to the D irect or of Intelllgence, Headquarter s United States Air Force . (4) Written r eports will be submitted on AF Form 112. (5) Commandlng Gener al, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and or ganizations under their control in connection with the devel op ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otQer than those of the United States Air Force are r equested to forward r eports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduc e the time fact or involved ln transmissi on of this type of informati on it is r equested that, wher ever c ommunications facilltles permit, subordinate elements be authorized to communicate r eports direct to the Commanding General, Air Materiel Com mand. PART II - REQUIREMENTS General 1. Date of sighting . 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer' s posltion) : a. Ground (1) City, town. (2) Distance and direction from city or t own, road, lnter sect1on, etc . (3) From building (story), yard, etc. (4) Map coordinates (if feasib le) showing latitude and longitude . - 2 - RESTRICTED

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city , town or known landmark . (3) Clock position of object from observer 's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proxlmity to land. (Name city, country, etc.) 4, Number of objects. Formation type (if any), sketch 1f possible . 6. Observable celestial phenomena or planets that may account for the slghtlng. (Local facillties or organ izati ons which follow such celestial phenomena should be consulted for such information.) 6. Distance of object fr om observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight . 8. Appearance of object . a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (l} Estimated size. (2) Size as Lt appeared from observer's view. (Compared to known object) 9. Direction of flight, 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osclllatlng, flutterlng, evasive , aggressive, erratic, etc. 11. Evidence of exhaust . a. Color of smoke . , b. Length and width. RESTRICTED - 3 -

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RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary wlth sound? (spurts) 12, Effect on clouds . a . Opened path thru clouds . b. Forced cloud or mists. c . Reflected on cloud. d. Showed thru cloud . 13. Lights. a. Reflected or attached . b. Luminous c . Blinked on and off in relation to speed. 14. Support a . Wings. b. Aer odynamic 11st of fuse lage . C . Vertical jet. d. Rotating cylinder or cone. e . Aer ostatic lift (balloon or dir igible) . 15. Pr opulslon . a . Pr opelle r or j et. b. Rotor. c . Aerodynamlc vanes (flapping or osclilating) (Katz Mayer effect). d. Visible eXhaust or j et openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical) . (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts . a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b, Roar, whistle , whoosh. c. Intermitt ent. 20. Manner of disappearance. a. Explode. (1) Poss ibility of fragments. (2) Other physical evidence . b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name o f observer . 2. Addr ess . 3. Occupation. 4. P lace of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronome r, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a . Color, b. Speed of moving objects . c . Size at distance. 7. Reliability of observe r. a . Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors . (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to obser ver on: a. Sightings in general. b. How attention was drawn to object{s). (1) Sound. (2) Motion. (3) Glint of light. c . Degree of fatigue and duration of flight at time of sighting ln cases where observe r ls airborne. 9. Witnesses. a . Addressees. b. Occupation. c. Reliability . 10. Comments of interrogator regarding the intelligence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed , altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn ls not observable, how long did the target stay in the turn and what was its speed? c . Note particula rly any separation of distant target into several targets upon approach. Track all 1f possible. 2. If airborne when object sighted. a. Were there any r adar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc . GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft r eport. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commerc1al, private and m1Utary aircraft flying ln viclnity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testlng devices in vicinity sent aloft by Ordnance , Navy, Air Force, Army, Weather Units, Research Organizations or any other . 5. If object contacted earth, obtain son samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terraln where observed. c. Place where 1t contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement . 9. Obtain fragments or physical evidence where poss ible. 10. Was any radi o antenna to be observed , i.e., (any projections or extentlons that might presum ably be construed as such). cl-!~ C. P. CABELL Major General, USAF Director of Intellige nce, Office of Deputy Chief of Staff, Operati ons DISTRJBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Spec ial Assistant for Research and Intelllgence, Department of State Dir ecto r of Intelllgence, GSUSA Chief of Naval Intelligence Comman dant (INT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 -

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RESTRICTED RESTRICTED

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 Am INTELLIGENCE REQUIB.EMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to s ightings of unconventional aircraft and unidentified flying objects , including the so-called "Flying Discs ." b. To establi sh procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948 , and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded . 3. REPORTING a. General (1) As complete an answer to the requirements enWlCiated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings . (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of IntelU gence, Headquarters United States Air Force . Cables wm contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0 -3." RESTRICTED C9-'892,AF

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RESTRICTED (2) Supplementary writt en reports, pr epared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Alr For ce. (3) Commandlng General , Alr Materiel Command ls authorized direct contact with major Air Commands (over seas) and organ izations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports wlll be forwarded dir ect to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by Installations r eceiv ing information pertaining to the r equir ements enunciated in Part II. (2) Copies of such r eports may be supplied the Command Headquarters of the installati on concerned. (3) A copy of all r eports sent to Air Materiel Command in accordance with these instruc tions wtll be forwarded at the same time to the Director of Intelligenc e, Headquarters United stat es Air Force . (4) Written r eports wm be submitted on AF Form 112. (5) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (ZI) and or ganizations under their control in connection with the develop ment of informati on on this subject. d. Non-Air Force Agencies (1) Addr essees ot.cyer than those of the United states Air For ce are r equeste d t o forward repo rts direct to the Commanding General, Air Materiel Command, Wright -Patterson Air Force Base , Dayton, Ohio, Attn: MCIAX0-3 . (2) In order to reduc e the time factor involved in transmission of this type of information it is r equested that, wher ever communications faciUties permit, subordinate elements be authorized to communicate r eports direct to the Commanding General , Air Materiel Com mand. PART IT - REQUIREMENTS General 1. Date of sighting . 2. Time of sighting (zonal by 24 hr. clock) . 3. Where sighted (observer 's position): a. Ground (1) City, town. (2) Distance and direction fr om city or town, r oad, inter section , etc. (3) From building (story), yard, etc . (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observe r's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude . (2) Proxlmity to land. (Name city, country, etc.) 4. Number of objects . Formation type (If any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organiz ations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon . c. Altitude. 7. Time in sight . 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of fllght. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating , fluttering, evasive, aggressive, erratic , etc. 11. Evidence of exhaust. a. Color of smoke . , b. Length and width. RESTRICTED - 3 - •

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RESTRICTED C. Odor (if any). d. Rate of evaporation . e. Does trall vary with sound? (spurts) 12. Effect on clouds. a . Opened path thru clouds . b. Forced cloud or mists. c. Reflected on cloud . d. Showed thru cloud . 13. Lights . a. Reflected or attached . b. Luminous c. Blinked on and off ln r elation to speed. 14. Support a. Wings. b. Aerodynamic Hst of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e . Aerostatic 11.ft (balloon or dirigible) . 15. Propulsion . a. Pr opeller or j et. b. Rotor . c. Aerodynamic vanes (flapping or osc1llat1ng) (Katz Mayer effect). d. Visible exhaust or jet openings . 16. Control and stabHity. a. Fins b. Stabil!.zers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTR I CTED 17. Air ducts. a. Slots. b. Duct openings . 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, w};loosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Poss1b1Uty of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle . Relattve to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 6. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience) . 6. Ability to determine: a. Color. b. Speed of moving objects . c. Size at distance. 7. Reliablllty of observer. a. Sources. RESTRICTED

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RESTRICTED (1) Neighbors . (2) Pollce Dept. (3) FBI records. (4) Employer . 8. Notes relative to observer on: a. Sightings in gener al. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Rellablllty . 10. Comments of interrogator regarding the lntelllgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of rang e, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay ln the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Tr ack all l.f possible. 2. If airb orne when object sighted. a. Were there any radar inductions or extra noise on radi o circuits? b. Give estimates of size , speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report . - 6 - RESTRICTED

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RESTRICTED 3. Local fllght schedules of commercial, private and mll1tary aircraft flying in vidnlty at the time. (Check Canadian activity l.f close to that border.) 4. Possible releases of testing devices in vlcinlty sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils . 6. If object came sufficiently near other aircraft or known objects check surfaces with Gelger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place wher e 1t contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement . 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, Le., (any projections or extentlons that might pr esum ably be construed as such). e>:P~ C. P. CABELL Major General, USAF Dlrector of Intelligence , Office of Deputy Chief of Staff , Operations DISTRlBUTION: Commanding Generals, Major Air Commands , ZI and Overseas All United States Air Attaches Directo r of Central lntelllgence Special Assistant for Research and Intelligence, Departmen t of State Directo r of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Directo r , Federal Bureau of Invest1gatlon RESTRICTED - 7 -

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RESTRICTED RESTRICTED

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpos e of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertalning to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to th e requirements enunciated 1n Part II, as may be procu r able, should be dispatched by means of electrical transmission immediately after sightings . (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelll gence, Headquarters United Stat (:s Air Force . Cables wl.11 contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3." RESTRICTED

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RESTRICTED (2) Supplementary wrltt en reports, prepared on AF For m 112, will be forwarded to the Director of Intelligence , Headquarters United States Air Force . (3) Commanding General , Air Materiel Command ls authorized direct contact with major Air Commands (over seas) and organi zations under their control in connection with the development of information on this subject , c . Major Air Commands (ZI) (1) Reports wm be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patte rson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations r eceiv ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquart ers of the installation concerned. (3) A copy of all r eports sent to Air Materiel Command in accordance with these instruc tions wm be forward ed at the same time to the Direct or of Intelligenc e, Headquarters United States Air Force. (4) Written r eports will be submitted on AF Form 112. (6) Commanding Gener al, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and or ganizati ons under their control in connection with the develop ment of informati on on this s ubject. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright- Patter son Air F orce Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type o f information it Ls r equested that, whereve r communications faciliti es permit , subordinate elements be authorized to communicate rep orts direct to the Commanding General, Air Materiel Com mand. PART II - REQUIB.EMENTS General 1. Date of s ighting. 2. Time of sightl.ng (zonal by 24 hr. clock). 3, Where sighted (observ er 's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) Fr om building (story), yard, etc. (4) Map coordinates (if feasible) showing lat itude and longitude. - 2 - RESTRICTED

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RESTRICTED b . Air (1) Type aircraft, speed, altitude, direction of fllght. (2) Distance and direction fr om city, town or known landmark . (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c . Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country , etc.) 4. Number of objects. Formation type (if any), sketch if possible. 6. Observable celestial phenomena or planets that may account for the slghtlng. (Local fac1lities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer . a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude . 7. Time in sight. 8, Appearance of object . a. Color. b. Shape. (Sketch 1f possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Slze as it appeared from observer's vlew. (Compared to known object) 9. Direction of fUght. 10. Tactics or maneuvers. Vertical ascent or descent, horiz ontal, oscillatlng, fluttering, . evasive , aggressive , er ratic, etc. 11. Evidence of exhaust. a. Color of smoke . , b. Length and width. RESTRICTED - 3 -

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RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with som1d? (spurts) 12. Effect on clouds. a. Opened path thru clouds . b . Forced cloud or mists. c . Reflected on cloud. d. Showed thru cloud. 13. Llghts. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed . 14. Support a. Wlngs. b. Aer odynamic Ust of fuselage . c. Vertical Jet. d. Rotating cyllnder or cone . e . Aeros tatic lift (balloon or dir igible). 15. Propulsion. a . P ropelle r or jet. b. Rotor. c. Aer odynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 18. Control and stability. a. Flns b. Stabilizers (hor izontal or v ertical) . (1) Size. (2) Shape. (3) Locat ion. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts. a. Slots. b. Duct openings . 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address . 3. Occupation. 4. Place of busine ss . a. Employer or employee. 5. Per tinent hobbies. a. Is observe r amateur astronomer, pl.lot, engineer, etc . b. Length of time engaged in hobby (experience). 6. Abllity to determine : a. Color. b. Speed of moving objects . c . Size at distanc e. 7. Reliability of observer . a . Sources . RESTRICTE D - 5 -

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RESTRICTED (1) Neighbors . (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observe r on: a. Sightings 1n general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light . c. Degree of fatigue and duration of flight at tlme of sightlng in cases where observe r is airborne . 9. Witnesses. a. Addressees. b. Occupation. c. Reliability . 10. Comments of interrogator regarding the intelUgence and character of person inter r ogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range , speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what r adius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon appr oach, Track all if possible . 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b, Give estimates of slze , speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local night schedules of commercial, private and m111tary aircraft flying 1n vicinity at the time. (Check Canadian activity 1f close to that border.) 4. Possible releases of testing devic es 1n vicinity sent aloft by Ordnance, Navy, Alr Force, Army, Weather Units, Research Organizations or any other. 6. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparis ons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surroundlng terrain where observed. c . Place where it contacted earth (if this happened). d. Maneuvers. e. FormaUon if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible . 10. Was any radi o antenna to be observed, i.e., (any pr ojections or extentions that might presum ably be construed as such) . c:1-?~ C. P. CABELL Major General, USAF Director of lntell1gence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intellig ence Special Assistant for Research and Intelligence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligenc e Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigati on RESTRICTED - 7 -

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of thls memorandum Is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects , lncludlng the so-called "Flying Discs. 11 b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January Hl48, and letter , CSGID 425 .1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings . (2) Supplementary r·eports should be forwarded as available by the most expeditious means consistent with the importance of the Information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelll gence, Headquarters United Statc,s Air Force. Cables will contaln the phase, "Pass to COMGENAMC WRIGHT- PATTERSON AFB, DAYTON, OHIO, ATTN : MClAX0-3." RESTRICTED

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RESTRICTED (2) Supplementary writt en r eports , prepared on AF Form 112, will be forward ed to the Direc tor of Intelligence, Headquarters United States Air Force . (3) Commanding General, Air Materiel Command is a uthorized direct contact wlth majo r Air Commands (overseas) and or ganizations under their cont r ol in connectio n wlth the development of information on this subject . c. Major Air Commands (ZI) (1) Reports wm be forward ed direct to the Commanding Gener al, Air Materiel Command, Wright-Patt erson Air Force Base , Dayton, Ohio, Attn: MCIAXO-3 by installations receiv ing information pertaining to the r equir ements enunciated in Part Il. (2) Copies of such r eports may b e supplied the Command Headquarters of the inst allation concerned . (3) A copy of all reports sent to Air Materiel Command In accor dance with these instruc tions will be forward ed at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written rep orts will be submitted on AF Form 112. (5) Commanding Gener al, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and or ganizati ons under their control in connection with the develop ment of informati on on thls subject. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are request ed to forward r eports direct to the Commanding General, Air Materiel Command, Wright-Patter son Air Force Base , Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduc e the time fact or involved in transmissi on of this type o f information it is r equested that, wherever communications facUlties permit, subordinate elements be author ized to communicate rep orts direct to the Commanding General, Air Materiel Com mand . PART ll - REQUffiEMENTS General 1. Date of sighting. 2, Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From bullding (story), yard, etc. (4) Map coor dinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED

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RESTRICTED b. Al.r (1) Type aircraft , speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer ' s aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name clty, country, etc.) 4. Number of objects. Formation type (if any), sketch If poss ible. 5. Observable celestial phenomena or planets that may account for the sighting . (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. ' a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object . a. Color. b. Shape. (Sketch if possible) c . Apparent construction. (Of what material or substance) d. Size. (1) Estimated size . (2) Size as l.t appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive , aggressive, erratic, etc . 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 -

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RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds . a. Opened path thru clouds . b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. 13. Lights . a. Reflected or attached. b. Luminous c. Blinked on and off in r elation to speed. 14. Support a. Wings . b. Aerodynamic list of fusel age . c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic 11ft (balloon or dirigibl e) . 15. Propulsion . a. Propeller or j et. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings . 16. Control and stablll.ty. a. Fins b. Stabillzers (horizontal or vertical) . (1) Size. (2) Shape. (3) Locatlon . - 4 - RESTRICTED

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RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P .H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, w}:loosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments . (2) Other physical evidence. b. Faded from view . C. Disappeared behlnd obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbles. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in bobby (experience). 6, Ablllty to determine: a. Color. b. Speed of moving objects . c. Size at distance. 7. Reliability of observ er. a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a, Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of Ught. c. Degree of fatigue and duration of flight at time of sighting in cases wher e observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. C. ReliabiUty . 10. Comments of interrogator regarding the intelUgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target . b. D1d target executive any turns? If so, what angle (180°), etc . and what radius of turn. If radius of turn 1s not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. I.f airborne when object sighted. a. Were there any radar inductions or extra noise on radio circu its? b. Give estimates of size, speed , maneuvers, etc . GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying 1n viclnlty at the time. (Check Canadian actlvlty 1f close to that border.) 4. Possible releases of testing devices in vicinlty sent aloft by Ordnanc e, Navy, Air For ce, Army, Weathe r Units, Research Organ izations or any other . 5. If object contacted earth , obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of solls . 6. If object came sufflclently near other aircraft or known objects check surfaces with Gelger counters for possible radi oactiv ity. Make comparisons wlth othe r unaffected aircraft objects , etc. 7. Obtain photographs (or origin al negatives) wher e available; Ii not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place wher e it contacted earth (lf this happened). d. Maneuver s. e. Formation lf objects wer e more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radi o antenna to be observed, Le., (any projections or exte ntlons that might presum ably be construed as such). c>: P.~ C. P . CABELL Major General, USAF Director of Intelllgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Dir ector of Intelligenc e, GSUSA Chief of Naval Intelligence Commandant (INT), Unit ed States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 -

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RESTRICTED DEPARTMENT OF THE Affi F ORCE HEADQUARTERS UNITED STATES AIR FORCE DffiECTORATE OF INTELLIGE NCE WASHINGTON 25, D. C. 15 Febr uary 1949 Affi INTELLIGENCE REQUIB.EMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AffiCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate contlnulng Air Force r equirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so -called "Flying Dlscs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1 , dated 25 March 1948, both subject as above, which have been transferred t o Air Force agencies for action , ar e herewith super seded . 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electr ical transmissi on immediately after sightings . (2) Supplementary reports should be for warded as available by the consistent with the importance of the lnformation r eported. most expediti ous means b. Major Air Commands (Over seas) and Air Attaches (1) Initial and supplementary cabled repor ts will be transmitted to the Director of Intem gence, Headquarters United Stat<::s Air Force. Cables will conta in the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3." RESTRICTED C9- IIH2,AF

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RESTRICTED (2) Supplementary writt en reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports w111 be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patters on Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by installations receiv ing Information pertaining to the requirements enunciated in Part II. (2) Coples of such reports may be supplled the Command Headquarters of the Installation concerned . (S) A copy of all reports sent to Air Materiel Command in accordance with these Instruc tions wlll be forwarded at the same time to the Directo r of Intelligence, Headquarters United States Air Force . (4) Writt en r eports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (ZI) and or ganizations under their control in connection with the develop ment of information on this subject. d. Non-Air Force Agencies (1) Addressees o~er than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3. (2) In order to reduce the time factor involved in transmission of this type of information 1t is requested that , wherever communications fac1litles permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART Il - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock) . 3. Where sighted (observer's position) : a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (If feasible) showing latitude and longitude. - 2 - RESTRICTED

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RESTRICfED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proxlml.ty to land. (Name city, country, etc.) 4. Number of objects. Formati on type (!.f any), sketch l.f possible. 5. Observable celestial phenomena or planets that may account for the sighting . (Local fac111ties or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or h orizontally. b. Angle of elevation from horizon . c. Altitude. 7. Time 1n sight. 8. Appearance of object. a. Color. b. Shape. (Sketch l.f possible) c. Apparent construction. (Of what material or substance) d. Sii.e . (1) Estimated size . (2) Sl.ze as lt appeared from observer 's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscilla ting, fluttering, evasive, aggressive , erratic, etc. 11. Evidence of exhaust. a. Color of smoke. 1 b. Length and width. RESTRICTED - 3 -

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RESTRICTED c. Odor (if any). d. Rate of evaporation . e . Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds . b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud . 13. Lights. a. Reflected or attached. b. Luminous c . Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic 11st of fuselage. c. Vertic al jet. d. Rotating cylinder or c one . e . Aerostatic lift (balloon or dirigible) . 15. P r opulsion . a . P r opeller or j et. b. Rotor. c . Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect) . d. Visible exhaust or jet openings. 16. Control artd stability . a . F!.ns b. Stabili zers (hor izontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of obse rver. 2. Address . 3. Occupation . 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer , etc . b. Length of time engaged in hobby (experience). 6. AbHity to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliab111ty of observ er . a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors . (2) Police Dept. (3) FBI records . (4) Employer. 8. Notes relative to observer on: a . Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of slghtlng in cases where observer ls airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Rellablllty. 10. Comments of interrogator regarding the intelllgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any tw-ns? If so, what angle (180°), etc . and what radius of turn. If radius of turn ls not observable , how long did the target stay in the turn and what was its speed? c . Note particularly any separation of distant target into several targets upon approach . Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local filght schedules of commercial, private and mmtary aircraft flylng In vicinity at the time. (Check Canadian activity If close to that border.) 4. Possible releases of testing devices In vicinity sent aloft by Ordnanc e, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils . 6. 11 object ca.me sufficiently near other aircraft or known objects check surfaces with Gelger cowiters for possible radi oact ivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; 1f not, secure sketches of: a. Object . b. Surrounding terrain where observed. c. Place where lt contacted earth (lf this happened). d. Maneuvers. e. Formation Ii objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possibl e . 10. Was any r adio antenna to be o bserved , L e. , (any projections or extentlons that might presum ably be construed as such). C. P. CABELL Major General, USAF Director of Intelllgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Gener als, Major Air Commands, ZI and Overseas All United States Air Attaches Dir ecto r of Central Intelligence Spec ial Ass istant for Research and IntelUgence, Department of State Director of Intell1gence, GSUSA Chief of Naval Intelllg ence Commandant (INT), United States Coast Guard DI.rector, Federal Bureau of Investigation RESTRIC TED - 7 -

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INI'ELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum Is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentlfied flying objects, including the so-called "Flying Discs. " b. To establish procedures for reporting such information . 2. RESCISSION Department of the Army Collection Memorandum Nwnber 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March HM8, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded . 3. REPORT ING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sighti ngs. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelll gence , Headquarters United States Air Force. Cables wm contain the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3. " RESTRICTED Cll-11892, AF

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RESTRICTED (2) Supplementary wr1tten reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force . (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and or ganizations under their control in connection with the development of information on thi s s ubject. c. Major Air Commands (ZI) (1) Reports wlll be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by insta llati ons r ece iv ing inform ation pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned . (3) A copy of all reports sent to Air Materiel Command in accordanc e with these instruc tions wlll be forward ed at the same time to the Director of Intellig ence , Headquarters United States Air Force. (4) Writt en reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command 1s authorized direct contact with major Air Commands (ZI) and organizati ons under their control in connection with the develop ment of informati on on this s ubject. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are r equested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmissi on of this type o f information it is requested that, wher ever communications fac111ties permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART II - REQUIREMENTS General 1. Date o f sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or t own, r oad, intersec tion, etc . (3) From building (story) , yard, etc. (4) Map coordina tes (if feasib le) showing latitude and longitude. - 2 - RESTRICTED

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RESTRICTED b. Air (1) Type aircraft, speed, altltude , direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude . (2) Proximity to land. (Name city, country, etc.) 4. Number of objects . Formation type (if any), sketch if possible. 6. Observable celestial phenomena or planets that may account for the sighting. (Local facillties or organizati ons which follow such celestial phenomena should be consulted for such information .) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon . C. Altitude. 7. Time in sight . 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osc illating, fluttering, evasive, aggress ive, erratic , etc. 11. Evidence of exhaust . a. Color of smoke. , b. Length and width. RESTRICTED - 3 -•

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RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail va:ry with sound? (spurts) 12. Effect on clouds . a. Opened path thru clouds. b. For ced cloud or mists . c. Reflected on cloud. d. Showed thru cloud. 13. Lights . a. Reflected or attached. b. Luminous c. Blinked on and off ln r elation to speed. 14. Support a . Wings. b . Aerodynam ic list of fuselage. c. Verti cal jet, d. Rotating cylinder or cone. e. Aer ostatic lift (balloon or dirigible) . 15. Pr opulsion. a. Propeller or jet. b. Rotor. c . Aerodynamic vanes (flapping or osc illating) (Katz Mayer effec t). d. Visible exh aust or Jet openings . 16. Control and stabili ty. a . Fins b. Stabillzers (horizontal or vertical). (1) Size. (2) Shape . (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts . a. Slots. b . Duct openings. 18. Speed - M.P.H . 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, wl;loosh. c. Intermittent. 20. Manner of disappearance . a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer . 2. Address. 3, Occupatlon. 4. P lace of business. a . Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pl.lot, engineer , etc. b. Length of time engaged in hobby (experience) . 6. Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance . 7. Reliabi11ty of observer . a. Sources. RESTRIC TED - 5 -

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RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records . (4) Employer. 8. Notes relative to observer on: a. Sightings in general . b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer ls airborne . 9. Witnesses. a. Addressees. b. Occupation. C. Reliablllty. 10. Comments of interrogator regarding the lntelllgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground . a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc . and what radiu s o f turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach . Tr ack all if possible. 2. I! airborne when object sighted. a. Were there any radar inductions or extra noise on rad lo circuits? b. Give estimates of size, speed , maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local fl1ght schedules of commercial , private and military aircraft flying ln vicfnity at the time. (Check Canadian activity 1f close to that border.) 4. Possible r eleases of testing devices 1n vicinity sent aloft by Ordnance , Navy, Air Force, Army, Weather Units, Research Organiza tions or any other. 5. Ii object contacted earth, obtain soil samp les within and without depr ession or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radi oacti vity. Make comparisons with other unaffected aircraft objects, etc. ? . Obtain photographs (or original negatives) wher e availabl e; 1f not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened) . d. Maneuvers . e. Formati on 1f objects wer e more than two. 8. Secure signed statement . 9. Obtain fragments or physical evidence wher e possi ble. 10. Was any r adio antenna to be observed, i.e ., (any projections or extentions that might presum ably be construed as such). C. P . CABELL Major General, USAF Director of Intel11gence, Office of Deputy Chief of Staff, Operations DISTRlBUTION: Command ing Generals , Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelllgence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Dire ctor, Federal Bureau of Investigation RESTRICTED - ? -

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DmECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciat e continuing Air Force requirements for informatl on pertaining to sightings of unconventional aircraft and unldentifi. ed flying objects, including the so- called "Flying Discs .,, b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith super seded. 3. REPORTING a. General (1) As compl ete an answer to the requirements enunciated in Part Il, as may be procur able, should be dispatched by means of elec trical transmiss ion immediately aft er sightings, (2) Supplementary r eports should be forwarded as available by the most expeditlous means consistent with the importance of the informati on r eported. b. Major Air Commands (Over seas) and Air Attaches (1) Initial and supplementary cabled r eports will be transmitted to the Director of Intelli gence, Headquarters United States Air Force. Cabl es wlll contain the phase, " Pass to COMGENAMC WRIGHT -PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0 -3.' ' RESTRICTED ce-,as2,AF ha ff 1K 9~-/t' '/r

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RESTRICTED (2) Supplementary written r eports, prepared on AF Form 112, wm be forwarded to the Director of IntelHgence, Headquarters United States Air Force. (3) Commanding General, Alr Materiel Command ls authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject . c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Alr Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv ing information pertaining to the requirements enunciated in Part II. (2) Copies of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otter than those of the United States Air Force are r equested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduc e the time factor involved in transmission of this type of information it is requested that , wherever communications facilltles permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Alr Materiel Com mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of slghtl.ng (zonal by 24 hr. clock). 3. Where sighted (observer's position) : a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc . (4) Map coordinates (if feasible) showing latitude and longitude. - 2 - RESTRICTE D

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of fUght. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude . c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc .) 4. Number of objects. Formation type (If any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilltles or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b . Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b . Shape. (Sketch if possible) c . Apparent constructlon. (Of what material or substance) d. Size. (1) Estimated s ize. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratlc, etc. 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 -

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RESTRICTED c. Odor (if any). d. Rate of evaporatlon. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. For ced cloud or mists. c . Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached . b. Luminous c. Blinked on and off in relation to speed . 14. Support a. Wings . b. Aerodynami c list of fuselage. c . Vertical jet. d. Rotating cylind er or cone. e. Aerostatic lift (balloon or dirigible) . 15. Propulsion . a. Propeller or j et . b. Rotor . c. Aerodynamic vanes (-flapping or oscl.llating} (Katz Mayer effect). d. Visible exhaust or j et openings . 16. Contr ol and stability . a. Fins b. Stabilizers (hor izontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts. a. Slots. b. Duct openings . 18. Speed - M.P .H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh . C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer . 2. Address. 3, Occupation . 4. Place of busin ess. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc . b. Length of time engaged in hobby (experience). 6. Ab111ty to determine: a. Color . b. Speed of moving objects. c. Size at distance. 7. Reliabillty of observer . a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors. (2) Pollce Dept. (3) FBI records. (4) Employer . 8. Notes relative to observer on; a. Sightings In general. b. How attention was drawn to object(s) . (1) Sound, (2) Motion. (3) Glint of Ught. c. Degree of fatigue and duration of flight at time of sighting in cases where observe r ls airborne . 9. Witnesses . a. Addressees. b. Occupation. c. Reliablllty. 10. Comments of Interrogator regarding the l.ntell1gence and character of person Interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target . b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was I.ts speed? c, Note particularly any separation of distant target into several targets upon approach. Tr ack all l.f possible . 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of slze, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather condtuons. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commercial , private and military aircra!t flying 1n vicinity at the time . (Check Canadian activity 1f close to that border.) 4. Possible releases of t esting devices 1n vicinity sent aloft by Ordnanc e, Navy, Air Force, Army, Weather Units, Research Organizati ons or any other. 5. If object contacted earth, obtain soil samples within and without depr ession or s pot wher e object landed (and then presumably departed) for purpose of making comparison of soils. 6. 11 object came sufficiently near other alrcra!t or known objects check surfa ces with Geiger counters for possible radi oactivity. Make comparisons with other unaffected a1rcra!t objects, etc . 7. Obtain photographs (or original negatives) wher e available ; if not, secure sket ches of: a. Object. b. Surrounding terrain wher e observed . c. Place wher e it contacted earth (If this happened). d. Maneuvers. e. Formati on 1f objects were mor e than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence wher e possible. 10. Was any radi o antenna to be observed, Le ., (any projections or extentl.ons that might presum ably be construed as such). C. P. CABELL Major General, USAF Director of Intellig ence, Office of Deputy Chief of Sta!f, Operations DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Director of Intelllgence, GSUSA Chief of Naval Intelligenc e Commandant {INT), United States Coast Guard Dire ctor, Federal Bureau of Investigation RESTRICTED - 7 -

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RESTRICTED RESTRICTED

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 Februa r y 1949 AIR INTELL IGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraf t and unidentified flying objects , including the so-called "Flying Discs .'' b. To establish procedures for reporting such information . 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencles for action , are herewith superseded . 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part n, as may be proc ur able , should be dispatched by means of electrical transm ission immediately after sightings . (2) Supplementary reports should be for warded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (overseas) and Air Attaches (1) Initial and supplementary cabled repor ts wm be transm itted to the Director of IntelU gence , Headquarte r s United State:s Air Force . Cables wlll contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN : MCIAX0-3." RESTRICTED ce- 11892, AF

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RES TRICTED (2) Supplementary written r eports , prepared on AF Form 112, will be forwarded to the Directo r of Intelllgence, Headquarters United States Air Force . (3) Commanding General , Air Materiel Command ls authorized direct contact with major Air Commands (overseas) and organizations Wlder their control in connection with the development of information on this subject . c. Major Air Commands (ZI) (1) Reports will be forward ed direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by installations r ece iv ing informati on pertaining to the r equiremen ts enW1ciated in Part II. (2) Copies of such r eports may be supplled the Command Headquarters of the installati on concerned . (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc tions wlll be forwarded at the same time to the Director of Intellig ence , Headquarters United States Air Force. (4) Writt en r eports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (ZI) and or ganizations W1der their control in connection with the develop ment of informati on on this subject. d. Non-Air Force Agencies (1) Addressees o~er than those of the United States Air Force are r equested to forward r eports direct to the Command ing General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3. (2) In order to reduc e the time factor lnvolved ln transmission of this type of lnformatlon it ls r equested that, wher ever communications faciUtl es permit, s ubordinat e elements be authorized to communicat e r eports direct to the Commanding General, Air Materiel Com mand. PART II - REQUffiEMENTS General 1. Date of sighting. 2. Time o f sighting (zonal by 24 hr. clock). 3. Wher e sighted (observer 's position) : a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersec tion, etc. (3) F r om building (story), yard , etc. (4) Map coordinates (I! feasible) showing latit ude and longitude. - 2 - RESTRICTED

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight . (2) Distanc e and direction from city, town or known landmark. (3) Clock position of object from observe r 's a ircraft . (4) Latitud e and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc .) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facl.llties or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object . a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size . (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horiz ontal, osc lllatl.ng, fluttering, evasive , aggressive, erratic , etc . 11. Evidence of exhaust. a. Color of smoke. •b. Length and width. RESTRICTED - 3 -•

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RESTRICTED c. Odor (if any). d. Rate of evaporation . e. Does trail va:ry with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mist s . c. Reflected on cloud. d. Showed thru cloud . 13. Llghts . a. Reflected or attached . b. Luminous i c. Blinked on and off in r elation to speed . 14, Support a. Wings. b. Aerodynamic 11st of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible) . 15. Propuls ion. a. Pr opeller or j et. b. Rotor. c. Aerodynamic vanes (flapping or osclllating) (Katz Mayer effect) . d. Visibl e exhaust or jet openings. 16. Control and stability . a. Fins b. StabiUzer s (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H . HJ. Sound. a, Continuous whine or buzz. b. Roar, whistle , wt)oosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) PossibHity of fragments. (2) Other physical evidence . b, Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer . 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee . 5. Pertinen t hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience) . 6. Ab111ty to determine: a. Color. b. Speed of moving objects . c. Size at distance. 7. Reliablll.ty of observer. a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors. (2) PoUce Dept. (3) FBI records . (4) Employer . 8. Notes relative to observer on: a. Sightings 1n general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting In cases where observe r ls airborne. 9. Witnesses. a. Addressees . b. occupation. c . Reliab111ty. 10. Comments of interrogator regarding the 1nte1Ugence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn ls not observable, how long did the target stay 1n the turn and what was Its speed? c. Note particularly any separation of distant target Into several targets upon approach. Track all Ii possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED S. Local flight schedules of commercial, private and military aircraft :flying in vic!nlty at the time. (Check Canadian activity 1f close to that border.) 4. Possible releases of testing devlces in vicinity sent aloft by Ordnance, Navy, Air Force, Ar my, Weather Units , Research Organlzatlons or any other . 5. If object contacted earth, obtain soll samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils . 6. If object came sufficiently near other aircraft or lmown objects check surfaces with Gelger counters for possible rad1oact1v1ty. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object . b. Surrounding terrain where observed . c. Place where it contacted earth (lf this happened). d. Maneuvers. e. Formation lf objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, Le., (any projections or extentlons that might presum ably be const rued as such) . c:P.~ C. P. CABELL Major General, USAF Directo r of Intelllgence, Office of Deputy Chief of Staff , Operations DISTRIBUTION: Commanding Generals , Major Alr Commands, ZI and Overseas All United States Alr Attaches Director of Central Intelligence Special A ssistant for Resea r ch and Intelligence , Depar tment of State Directo r of Intelligence, GSUSA Chief of Naval Intelllgence Commandant (I.NT), United States Coast Guard Directo r , Federal Bureau of Investigation RESTRICTED - 7 -

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum ls twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unldentlfled flying objec ts, including the so-called "Flying Discs." b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and lett er, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transfer red to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings, (2) Supplementary reports should be forwarded as ava1lable by the most expeditious means consistent with the importance of the information reported. b, Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports wlll be transmitted to the Director of Intem gence, Headquarters United States Al.r Force . Cables wl.11 contain the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3." RESTRICTED ta- 8~k94'-/~ 1/

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RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, wlll be forwarded to the Director of Intelligence, Headquarters United States Alr Force. (3) Commanding General, Air Materiel Command ls authorized direct contact with major Alr Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports wm be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MClAX0-3 by inst allati ons receiv ing information pertaining to the requirements enunciated in Part Il. (2) Coples of such r eports may be supplied the Command Headquarters of the Installation concerned. (3) A copy of all reports sent to Air Materiel Command In accordance with these inst r uc tions will be forwarded at the same time to the Director of Intelllgence, Headquarters United States Air Force . (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command Ls authorized direct contact with major Air Commands (ZI) and or ganizati ons under their control In connection with the develop ment of information on this subject. d. Non-Air Force Agencies (1) Address ees ot~er than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3. (2) In order to reduce the time factor involved in transmission of this type of information Lt ls requested that, wherever communications facilities permit , subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART II - REQUIREMENTS General 1. Date of sighting . 2. Time of sighting (zonal by 24 hr . clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, r oad, intersection, etc. (3) From building (story), yard, etc . (4) Map coordinates (11 feasible) showing latitude and longitude. - 2 - RESTRICTED

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RESTRICTED b, Air (1) Type a1rcraft, speed, alutude, d1rection of fUght. (2) Distance and d1rection from city , town or known landmark. (3) Clock posltlon of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude . (2) Pr oximity to land. (Name city, country, etc .) 4. Number of objects . Formation type (lf any), sketch 1f possible. 5. Observable celestlal phenomena or planets that may account for the sight1ng. (Local £ac1Uties or organizations which follow such celestial phenomena should be consulted for such Lnformatlon.) 6. Distance of object from observer. a. Laterally or hor1zontally . b. Angle of elevation from horiz on. c . Altitude. 7. Time in sight. 8. Appearance of object . a . Color. b. Shape. (Sketch if possible) c . Apparent construction . (Of what material or subs tance) d, Size, (1) Estimated size . (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers . Vertical ascent or descent, horizontal, oscllla tlng, fluttering, evasive , aggressive , erratic, etc . 11. Evidence of exhaust. a. Color of smoke . , b. Length and width. RESTRICTED - 3 -

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RESTRICTED c. Odor (if any). d. Rate of evaporation. e . Does trail vary wl.th sound? (spurt s) 12. Effect on clouds. a . Opened path thru clouds. b. Forced cloud or ml.sts. c. Re.fleeted on cloud. d. Showed thru cloud. 13. Llghts. a. Reflected or attached. b. Lumin ous c . Blinked on and off in r elation to speed . 14, Support a. Wings. b. Aerodynamic list of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatl.c lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillatlng) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stabllit y. a. Fins b. Stabilizers (horizontal or v ertical) . (1) Sl.ze. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts . a. Slots. b. Duct openings. 18. Speed - M.P .H. 19. Sound. a. Continuous whine or buzz. b. Roar , whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a . Explode. (1) Possibil!.ty of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstac le. Relat!.ve to the Observer 1. Name of observer . 2. Address . 3. Occupation . 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is o bserver amateur astronomer, pilot , engineer, etc . b. Length of time engaged in hobby (experie nce). 6. Ability to deter mine : a. Color . b. Speed of moving objects. c. Size at distance. 7. Rellabillty of obse rver . a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records . (4) Employer . 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s) . (1) Sound. (2) Motion. (3) Glint of light . c. Degree of fatigue and duration of flight at time of slghtlng in cases where observer is air borne. 9. Witnesses . a. Addressees. b. Occupation. C . ReUabiUty. 10. Comments of interrogator regarding the intelUgence and character of person inte r rogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range , speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn . If radius of turn ls not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target Into several targets upon approach. Tr ack all if possible . 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc . GENERAL 1. Teletype sequences of local weather condlt1ons . 2. Winds aloft report . - 6 - RES TRICTED

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RESTRICTED S. Local flight schedules of commercial, private and military airc raft flying In vicinity at the time. (Check Canadian activity if close to that border .) 4. Poss ible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force , Army, Weather Units, Research Organizations or any other . 6. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radi oactiv ity . Make comparisons with other unaffected aircrait objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain wher e obse rved. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation 1f objec ts were more than two. 8. Secure signed statement. 9. Obtain fragm ents or physical evidence wher e possible. 10. Was any radi o antenna to be observed , i.e., (any projections or extentlons that might presum ably be construed as such). cf-?~ C. P. CABELL Major General, USAF Director of Intelllgence, Office of Deputy Chief of Staff , Operati ons DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and overseas All United States Air Attaches Dir ector of Central IntelUgence Special Ass istant for Research and Intelligence, Department of State Director o:f Intelllgenc e , GSUSA Chief of Naval Intelligence Commandant (!NT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 -

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RESTRICTED RESTRICTED I I

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 16 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objec ts , including the so-called "Flying Discs. " b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army CollecUon Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action , are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli gence, Headquarters United States Air Force. Cables wm contain the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.'' RESTRICTED C9•11892,.4F

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RES TRIC T ED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact wlth major Air Commands (overseas) and organizations under their control in connection with the development of information on this subjec t. c. Major Air Commands (ZI) (1) Reports wlll be forwarded direct to the Commanding General, Air Materiel Command , Wright-Patterson Air Force Base , Dayton, Ohio, Attn: MCIAX0-3 by installations r ece iv ing information pertaining to the requirements enunciated in Part II. (2) Copies of such r eports may be supplied the Command Headquarters of the installation conce rned. (3) A copy of all reports sent to Air Materiel Command in acco r dance with these instruc tions will be forwarded at the same time to the Director of Intellig ence, Headquarter s United States Air Force. (4) Written r eports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (ZI) and organi zations under their contr ol in connection wlth the develop ment of information on this subjec t. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are r eques ted to forward r eports direct to the Commanding General, Alr Materiel Command, Wright-Patterson Air Force Base , Dayton, Ohio, Attn: MCIAX0-3. (2) In order to r educe the time factor involved in transmission of this type of information it is r equested that, wherever communications facilities permit , subordinate eleme nts be authorized to communicate reports direct to the Commanding General, Alr Materiel Com mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Wher e sighted {observe r's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road , intersection, etc . (3) Fr om building (story), yard, etc . (4) Map coord inates (if feasible) showing latitude and longitude. - 2 - RESTRICT ED

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RESTRICTED b. Air (1) Type aircraft, speed, altitude , direction of flight. (2) Distance and direction from city, town or known landmark . (3) Clock position of object from observer's aircraft. (4) Latitud e and longitude. c. Sea (1) Latit ude and longitude. (2) Pr oximity to land. (Name city, country, etc.) 4. Number of objects. Formati on type (If any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting . (Local faciUtles or organizati ons which follow such celestial phenomena should be consulted for such information.) 6. Distance of object fr om observer . a. Laterally or horizontally. b. Angle of elevati on from horizon . c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch If possible) c. Apparent construction. (Of what material or substanc e) d. Size. (1) Estimated size. (2) Size as lt appeared from observer's view. (Compared to known object) 9. Dir ection of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horiz ontal, oscillating , fluttering, evas ive, aggressive, erratic, etc . 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 -

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RESTRICTED c. Odor (!.f any). d. Rate of evaporation. e. Does trail va:ry with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists . c. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blmked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic 11st of fuselage. c . Vertical jet. d. Rotating cylinder or cone. e. Aerostatic liit (balloon or dirigible). 15. Propuls ion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or osclllating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical) . (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts . a. Slots . b. Duct openings . 18. Speed - M.P .H. 19. Sound. a. Contin uous w hine or buzz. b. Roar, whistle , w };l.oosh. c. Inter mittent . 20. Manner of disappearance . a. Explode. (1) Poss lblUty of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeare d b ehind obstacl e. Relati ve to the Observer 1. Name o f observer . 2. Addr ess . 3. Occupation. 4. Place o f busin ess . a. Employer or employee. 5. Pertin ent hobbles . a. Is observer amat eur astronomer, pilot, engineer, etc . b . Length of time engaged l.n hobby (experience). 6. Ablllty to determine: a. Color . b. Speed of m oving objects . c. Size at distance. 7. Reliabil ity of observer. a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors . (2) Police Dept. (3) FBI records , (4) Employer. 8. Notes relative to obser ver on: a. Sightings in general. b. How attention was drawn to object(s}. (1) Sound. (2) Motion. (3) Glint of light. c . Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses . a. Addressees. b. Occupation. c. Rellab1Uty. 10. Comments of interrogator regarding the intelllgence and character of person interrogate d. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon appr oach. Track all Ii possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers , etc. GENERAL 1. Teletype sequences of local weather conditions . 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commercial, privat e and military aircraft flying 1n vicinity at the time. (Check Canadian activity If close to that border.) 4. Pos sible releases of testing devices in vicinity sent aloft by Ordnanc e, Navy, Air For ce, Army, Weather Units, Research Organizati ons or any other . 6. If object contact ed earth , obtain sol.l samples within and without depr ession or spot wher e object landed (and then presumably depar ted) for purp ose of making comparis on of soils . 6. If object came sufficiently near other aircraft or known objects check surfaces with Gelger counters for possible radi oactivity. Make comparisons with other unaffected aircraft objects , etc. 7. Obtain photographs (or original negatives) wher e available; 1f not, secure sketches of: a. Object. b. Surr ounding terrain wher e observed . c. Place where it contacted earth (lf this happened) . d. Maneuvers. e. Formati on if objects wer e more than two. 8. Secure signed state ment. 9. Obtain fragm ents or physi cal evidence where possible. 10. Was any radi o antenna to be observed, i.e., (any projections or extentions that might presum ably be construed as such). C. P . CABELL Major General, USAF Director of Intelllgenc e, Office of Deputy Chief of Sta.ff, Operati ons DISTRIBUTION: Commanding Generals, Major Air Commands, ZI and Overseas All United States Air Attaches Dire ctor of Central Intelllgenc e Special Assistant for Research and Intelligence , Department of State Direct or of Intelligenc e , GSUSA Chief of Naval Intelllgence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investlgatlon RESTRICTED - 7 -

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum ls twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional air craft and unidentified flying objects , including the so~called "Flying Discs. " b. To establish procedures for reporting such information . 2. RESCISSION Department of the Army Collectlon Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for actlon , are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of elec trical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expedit ious means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelll gence, Headquarters United State:s Air Force . Cables will contain the phase, " Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3." RESTRICTED

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RESTRICTED (2) Supplementary written reports, pr epared on AF For m 112, will be forwarded to the Director of Intelligence, Headquart er s United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organization s under their contr ol in connec tion with the development of informati on on this s ubject. c. Major Alr Commands (ZI) (1) Reports will be forward ed direct to the Commanding General, Air Mater iel Command, Wright- Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by Installations r eceiv ing information pertaining to the requir ements enunciated in Part II. (2) Coples of such r eports may be supplied the Command Headquarters of the inst allati on conce rned. (3) A copy of all r eports sent to Air Materiel C ommand in accordance with thes e instruc tions will be forward ed at the same time to the Directo r of Intelllgenc e , Headquarters United States Air Force . (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command ls authorized direct contact with major Air Commands (ZI) and organ izations under their control in connection with the develop ment of information on this s ubjec t . d. Non-Air Force Agencies (1) Addressees otqer than those of the United States Air Force are requested to forward r eports direct to the Commanding Gener al, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3. (2) In order to reduce the tlme fact or involved 1n transmission of this type of informa tion it ls requested that , wherever communications faciliti es permit , subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART Il - REQUIREMENTS General 1. Date o f sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Wher e sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or t own, road , Intersecti on, etc. (3) From building (story), yard, etc . (4) Map coor dinates (if feasible) showing latitude and longitude. - 2 - RESTRICTED

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RESTRICTED b, Air (1) Type aircraft , speed, altitude, direction of flight . (2) Distance and direction fr om city , town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latltude and longitude . c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city , countr y, etc .) 4. Number of objects . Formation type (!f any), sketch if possible . 5. Observable celestial phenomena or planets that may account for the sighting . (Local faclli tles or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer . a. Laterally or horizontally . b. Angle of elevation from hor izon. c. Altitude. 7. Tl.me 1n sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction . (Of what material or substance) d. size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Dir ection of flight. 10. Tactics or maneuvers . Vert ical ascent or descent, horizontal , osclllating, fluttering, evasive, aggressive, er ratic, etc . 11. Evidence of exhaust. a. Color of smoke. , b. Length and width. RESTRICTED - 3 -

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RESTRICTED c . Odor (if any). d. Rate of evaporation. e. Does trall vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds . b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud . 13. Lights . a. Reflected or attached . b. Luminous c. Bllnked on and off l.n relation to speed. 14. Support a. Wings. b. Aerodynamic list of fusel~e. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible) . 15. Propulsion. a. Pr opeller or j et. b. Rotor. c. Aerodynamlc vanes (flapping or oscUlating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. StabiHzers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED

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RESTRIC TED 17. Air ducts . a. Slots. b. Duct openlngs . 18. Speed - M.P .H. 19. Sound. a. Contlnuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode . (1) Poss ibility of fragm ents . (2) Other physical evidence. b. Faded from view, c. Disappeared behind obstacle. Relative to the Observer 1. Name o f observe r. 2. Address . 3. Occupation . 4. Place of busin ess. a. Employer or employee. 5. Pertinent hobbies. a . Is observer amateur astronomer, pilot, engineer, etc. b. Length of time e ngaged in hobby (exper ience). 6. Ability to determin e: a. Color. b. Speed of moving objects . c. Size at distance. 7. Re11ab111ty of observer. a. Sourc es. REST RICTED - 5 -

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RESTRICTED (1) Neighbors . (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to oblect(s). (1) Sound. (2) Motion. (3) Glint of light . c. Degree of fatigue and duration of flight at time of sighting ln cases where observer is airborne . 9. Witnesses. a. Addressees . b. Occupation . c. Rell.ability . 10. Comments of interrogator regarding the lntelHgence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a . Observations of range, speed , altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc . and what radius of turn . If radius of turn ls not observable , how long did the target stay in the turn and what was I.ts speed? c. Note particularly any separation of distant target into several targets upon approach . Track all 1f possible. 2. If airborne when object sighted . a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commercial, private and m111tary aircraft flylng ln vicinlty at the tlme. (Check Canadian activity 1f close to that border.) 4. Possible releases of testing devices 1n vicinity sent aloft by Ordnance, Navy, Air Force , Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of sons. 6. If object came sufficiently near other aircraft or known objects check surfaces with Gelger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a . Object. b. Surrounding terrain where observed . c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation 1f objects were more than two. 8. Secure signed statement , 9. Obtain fragments or physical evidence where possible. 10. Was any r adlo antenna to be observed, Le., (any projections or extentions that might presum ably be construed as such). c.P~ C. P. CABELL Major General, USAF Director of IntelUgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals , Major Air Commands , ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Research and Intelligence, Department of State Director of Intelligence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigation AESTRICTED - 7 -

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RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum ls twofold: a. To enW1ciate continuing Alr Force requirements for information pertaining to sightings of Wlconventlonal aircraft and Wlidentified flying objects, including the so -called "Flying Discs ." b. To establish procedures for reporting such informatlon. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enW1ciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the information reported. b. Major Air . Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli gence, Headquarters United State:s Air Force . Cables wUl contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MClAX0-3." RESTRICTED

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RESTRICTED (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is auth orized dir ect contact wlth major Air Commands (overseas) and organizations under their control in connection with the development of in.formation on this subject. c. Major Air Commands (ZI) (1) Reports wm be forward ed direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by installations receiv ing information pertaining to the requirements enunciated in Part II. (2) Coples of such reports may be supplled the Command Headquarters of the installation concerned . (3) A copy of all reports sent to Air Materiel Command in acco r dance with these instruc tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under thei r control in connectlon with the develop ment of information on this subject. d. Non-Air Force Agencies (1) Addressees otQer than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3. (2) In order to reduce the time factor involved in transmission of this type of information it is r equested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART ll - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr . clock) . 3. Where sighted (observer's position) : a. Ground (1) City, town. (2) Distance and dir ection from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinat es (if feasible) showing latitud e and longitude. - 2 - RESTRICTED

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RESTRICTED b , Air (1) Type aLrcraft, speed, altltude, direction of fllght. (2) Distance and direction from city, town or known landmark. (3) Clock positlon of object from observe r's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (1! any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting . (Local faciliti es or organizations which follow such celestial phenomena should be cons ulted for such information .) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of eleva tion from horizon . c. Altitud e. 7. Time in sight. 8, Appearance of object . a. Color. b. Shape. (Sketch if posslble) c. Apparent constructlon. (Of what material or substance) d. Size. (1) Estimated slze . (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of fllght . 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, osclllat1ng, fluttering, evasive, aggressive, erratic, etc . 11. Evidence of exhaust. a. Color of smoke. 1 b. Length and width. RESTRICTED - 3 -•

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RESTRICTED C. Odor (1.f any). d. Rate of evaporation . e. Does trail vary wlth sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists . c. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b . Lumlnous c. Blinked on and off ln r elation to speed. 14. Support a. Wings. b. Aer odynamic list of fuselage. c. Vertical jet. d. Rotating cylinde r or cone. e . Aerostatlc llit (balloon or d lr1glble). 16. Propulsion. a. Propeller or j et . b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability . a. Fins b. Stab111zers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTE D

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RESTRICTED 17. Air ducts. a. Slots. b. Duct openings . 18. Speed - M.P.H. 19. Sound. a. Continuous whlne or buzz. b. Roar I whistle , wooosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle . Relatlve to the Observer 1. Name of observer . 2. Address. 3. Occupation . 4. Place of buslness. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). e. Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliability of observer . a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI r ecords. (4) Employer. 8. Notes relative to observer on: a. Sightings in general . b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observe r is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regard ing the intelligence and characte r of person interrogated. Relative to Rada r Sightings 1. Re radars operating on ground. a. Observations of range, speed , altitude and size of targe t. b. Did targ et executive any turns? If so, what angle (180°), etc . and what radiu s o f turn. If radiu s of turn is not observable , how long did the target stay in the turn and what was its speed? c . Note particular ly any sepa rati on of distant target into several targets upon approach. Track all Ii possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size , speed , maneuvers, etc . GENERAL 1. Teletype sequences of local weathe r conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commercial, private and m.111tary aircraft flying In vicinity at the time. (Check Canadian activity 1f close to that border.) 4. Poss ible r eleases of testing devices 1n vicinity sent aloft by Ordnance, Navy, Air For ce, Army, Weather Units, Research Organiza tions or any other . 6. If object contacted earth, obtain son samples within and without depr ession or spot where obj ect landed (and then presumably departed) for purpose of ma.king compar ison of soils. 6. 11 object came suffic ientl y near other aircraft or known objects check s urfaces with Geiger counters for possible radioactivity . Make comparisons with other unaffected aircraft objects , etc . 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain wher e observed . c. Place wher e it contacted earth (1.f this happened). d. Maneuvers. e. Formati on if objects were more than two. 8. Secure signed statement . 9. Obtain fragm ents or physical evidence wher e possible. 10. Was any radi o antenna to be observed, Le., (any pr ojections or extentlons that might presum ably be construed as such) . C. P . CABELL Major General, USAF Director of Intelligence , Office of Deputy Chief of Staff, Operati ons DISTRlBUTION: Commanding Generals, Major Alr Commands , ZI and overseas All United States Air Attaches Dire ctor of Central Intelligence Special Assistant for Research and Intelllgence, Department of State Dir ector of Intelligence , GSUSA Chief of Naval Intelllgence Commandant (INT), United States Coast Guard Dir ecto r, Federal Bureau of Investigation RES TRI CT ED - 7 -

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RESTRICTED DEPARTMENT OF THE Affi FORCE HEADQUARTERS UNITED STATES AIR FORCE DmECTORATE OF INTELLIGENCE WASHINGTON 26, D. C. 15 Febr uary Hl49 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL Am.CRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold : a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs .'' b. To establlsh procedures for reporting such information . 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter , CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be proc ur able, should be dispatched by means of electrical transmission immediately after sightings . (2) Supplementary reports should be forwarded as available by the most expeditio us means consistent with the importance of the information reported. b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transmitted to the Dir ector of Intelli gence, Headquarters United Statc,s Air Force. Cables wm contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB , DAYTON, OHIO, ATTN: MCIAX0-3." RESTRICTED C9•11892,AF b ~ - ff 1t- 9~-/t' '/

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RESTRICTED (2) Supplementary writt en repor ts, prepared on AF Form 112, wlll be forwarded to the Director of Intelll.gence, Headquar ters United States Air Force. (3) Commanding General , Air Materiel Command ls authorized direct contact WI.th major Air Commands (overseas) and or ganlzatl.ons under their control ln connection with the development of information on this s ubject. c. Major Air Commands (ZI) (1) Reports will be forward ed direct to the Commanding General, Air Mater iel Comman d, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3 by installations r eceiv ing information pertaining to the r equir ements enunciated in Part II. (2) Copies of such r epor ts may be supplied the Command Headquart er s o f the installati on conce rned . (3) A copy of all r eports sent to A ir Materiel Command in accordance with these instruc tions wlll be forwarded at the same ti.me to the Director of Intelligenc e, Headquarters United State s Air Force. (4) Written r eports wlll be submitted on AF Form 112. (6) Commanding General, Air Materiel Command is a uthorized direct contact with major Air Commands (Zl) and or ganizations under their control ln connection with the develop ment of informati on on this subject. d. Non-Air Force Agencies (1) Addressees ot~er than those of the United States Air Force are r equested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAX0-3. (2) In order to r educe the ti.me factor involved in transmis sion of this type of informati on it is r equested that, wher ever communications faciliti es permit, subordinat e e lements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART II - REQUIB.EMENTS General 1. Date of sighting . 2. Tl.me of sighting (zonal by 24 hr. clock) . 3. Wher e s ighted (observer 's position): a. Ground (1) City, town. (2) Distance and direction from city or town, r oad, intersection, etc. (3) Fr om building (story ), yard, etc. (4) Map coordi nates (if feasible) showing latitude and longitude. - 2 - RESTRICTE D

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and dlrectlon from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude . c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (Lf any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c . Altitude. 7. Time 1n sight . 8. Appearance of object. a. Color . b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating , fluttering, evasive, aggressive , erratic, etc. 11. Evidence of exhaust. a . Color of smoke. , b. Length and width. RESTRICTED - 3 -

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RESTRIC TE D C. Odor (if any). d. Rate of evaporation. e. Does trall vary with sound? (spurts) 12. Effect on clouds . a. Opened path thru clouds . b. For ced cloud or mists . c . Reflected on cloud. d. Showed thru cloud. 13. Lights . a. Reflected or attached . b. Luminous c. Bllnked on and off i n relation to speed. 14. Support a. Wings. b. Aer odynamic list of fuselage . c. Vertical jet. d. Rotating cylinde r or cone. e. Aer ostatic lift (balloon or dirigible). 15. Pr opuls ion. a. Pr opeller or j et . b. Rotor . c . Aerodynamic vanes (flapping or oscill ating) (Katz Mayer effect) . d. Vlslble exhaust or jet openings. 16. Cont rol and stabilit y. a . Fins b. Stabili zer s (hor izontal or vert ical). (1) Size. (2) Shape . (3) Location. - 4 - RESTRICTED

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RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a . Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possib111ty of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of obse rver. 2. Address. 3. Occupation . 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pUot, engineer , etc . b. Length of time engaged in hobby (experience). 6. Abllity to determine: a. Color . b. Speed of moving objects. c . Size at distance. 7. Rellabllity of observer. a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records . (4) Employer . 8. Notes relative to observer on: a. Sightings in genera l. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne . 9. Witnesses. a. Addressees . b. Occupation. c. Reliability . 10. Comments of interrogator regarding the Lnte111gence and character of person inter r ogated . Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay 1n the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach . Track all 1f possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size , speed, maneuvers, etc . GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vic1n1ty at the tlme. (Check Canadian activity 1f close to that border.) 4. Possible releases o:f testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other . 6. If object contacted earth , obtain son samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters :for possible radi oactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) wher e available ; if not, secure sketches of: a. Object. b. Surrounding terrain where observed . c. Place where it contacted earth (1:f this happened). d. Maneuvers. e. Formati on 1:f objects were more than two. 8. Secure signed statement. 9. Obtain fragm ents or physical evidence where possible. 10. Was any radi o antenna to be observed, Le., (any pr ojections or extentions that might presum ably be construed as such). e>:P~ C. P. CABELL Major General, USAF Director of IntelUgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Air Commands , ZI and Overseas All United States Air Attaches Director of Central Intelligence Special Assistant for Resea r ch and Intelllgence, Department of State Director of Intellig ence , GSUSA Chief of Naval Intelligence Commandant (I.NT), United States Coast Guard Director, Federal Bureau of Investigation RESTRICTED - 7 -

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RESTRICTED DEPARTMENT OF THE Am FORCE HEADQUARTERS UNITED STATES Am FORCE DmECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 UNCONVENTIONAL AIRCRAFT PART I - GENERAL 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentifled flying objects , including the so-called "Flying Discs ." b. To establish procedures for reporting such information. 2. RESCISSION Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter, CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air Force agencies for action, are herewith superseded. 3. REPORTING a. General (1) As complete an answer to the requirements enunciated in Part II, as may be procur able, should be dispatched by means of electrical transmission immediately after sightings. (2) Supplementary reports should be forwarded as available by the most expeditious means consistent with the importance of the informaUon reported . b. Major Air Commands (Overseas) and Air Attaches (1) Initial and supplementary cabled reports will be transm itted to the Director of Intelli gence, Headquarters United States Air Force. Cables will contain the phase, "Pass to COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAX0-3 ." RESTRICTED C9·'892,AF

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RESTRICTED (2) Supplementary writt en reports, prepared on AF Form 112, wlll be forwarded to the Director of Intellig ence , Headquarters United States Alr Force . (3) Commanding General, Air Materiel Command ls authorized direct contact with major Alr Commands (oversea s) and organi zations under their control ln connection wlth the development of informati on on this subjec t. c. Major Air Commands (ZI) (1) Reports will be forward ed direct to the Commanding General, Alr Materiel Command , Wright-Patters on Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv ing informati on pertaining to the r equirements enunciat ed in Part II. (2) Copies of such r eports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command ln accordanc e with these instruc tions will be forwarded at the same tlme to the Director of Intelllgence, Headquart ers United States Air Forc e. (4) Written r eports wlll be submitted on AF Form 112. (5) Commanding General, Air Mate riel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop ment of informati on on this subject. d. Non-Alr Force Agencies (1) Address ees ot~er than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command , Wright-Patters on Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 . (2) In order to reduce the time factor involved in transmissi on of this type of information it is requested that, wher ever c ommunications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com mand. PART II - REQUIREMENTS General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position) : a. Ground (1) City, town. (2) DI.stance and direction from city or t own, road, intersection, etc. (3) From building (story), yard, etc . (4) Map coordinates (l.f feasib le) s howing latitude and longitude. - 2 - RESTRICTED

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RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock posltlon of object from observe r's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country , etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer . a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color . b. Shape. (Sketch 1f possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9, Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscl.llating, fluttering, evasive , aggress ive, erratic, etc . 11. Evidence of exhaust. a. Color of smoke. , b. Length and width, RESTRICTED - 3 -•

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RESTRICTED c. Odor (1f any). d. Rate of evaporation . e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a . Reflected or attached. b. Luminous c. Blinked on and off in r elatio n t o speed . 14. Support a. Wings. b. Aerodynamic list of fuselage . I c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propuls ion. a. Propeller or jet. b. Rotor. c . Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Contr ol and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location . - 4 - RESTRICTED

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RESTRICTED 17. Alr ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle , wl;loosh. C. Intermittent. 20. Manner of disappearance. a. Explode . (1) Posslblllty of fragments. (2) Other physical evidence . b. Faded from view. c. Disappeared behind obstacle . Relative to the Observer 1. Name of observer . 2. Address . 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinen t hobbles. a. Is observer amateur astronome r , pilot , engineer, etc. b. Length of time engaged in hobby (experience). 6. Abllity to determine: a. Color. b. Speed of moving objects. c. Size at distance . 7. ReliabiUty of observer. a. Sources. RESTRICTED - 5 -

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RESTRICTED (1) Neighbors . (2) PoUce Dept. (3) FBI r ecords. (4) Employer. 8. Notes relative to observer on: a. Sightings 1n general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses . a. Addressees. b. Occupation. c. Reliab1Uty. 10. Comments of interr ogator regarding the intelllgence and character of person interrogated. Relati ve to Radar Sightings 1. Re radars operating on ground. a. Observa tions of rang e, speed, altitude and size of target. b. Did targ et executive any turns? If so , what angle (180°), etc . and what radius of t urn. If radiu s o f turn is not observabl e, how long did the targ et stay in the turn and what was 1ts speed? c. Note particularly any separation of distant target into several targets upon approach. Tr ack all 1f possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radi o circuits? b. Glve estimates of size , speed , maneuvers, etc. GENERAL 1. Teletype sequences of l ocal weather conditi ons. 2. Winds a.loft report. - 6 - RESTRICTED

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RESTRICTED 3. Local flight schedules of commercial , private and m111tary a1rcra!t flying in vicinity at the time. (Check Canadian activity 1f close to that border.) 4. Poss ible releases of testing devices 1n vicinity sent aloft by Ordnance , Navy, Air Force, Army, Weather Units, Research Organizatlons or any other. 5. If object contacted earth , obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of solls. 6. I! object came suffic iently near other aircraft or known objec ts check surfaces with Gelger counters for possible radioactivity. Make compa risons with other unaffected alrc r att objects , etc. 7. Obtain photographs (or original negatives) where availab le; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place wher e it contacted earth (if this happened). d. Maneuvers. e. Formation 1f objects were more than two. 8. Secure s igned statement. 9. Obtain fragmen ts o r physical evidence where possible . 10. Was any radi o antenna to be observed, Le ., (any pr ojections or extentions that might presum ably be construed as such), c l?~ C. P. CABELL Major General , USAF Director of IntelHgence , Office of Deputy Chief of Sta!f, Operati ons DISTRIBUTION: Commanding Generals, Major Air Commands , ZI and Overseas All United States Air Attaches Direct or of Central Intell1gence Special Assistant for Research and Intelllgence , Department of State Director of IntelHgence, GSUSA Chief of Naval Intelligence Commandant (INT), United States Coast Guard Director, Federal Bureau of Investigation RESTRI CT ED - 7 -

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RESTRICTED RESTRICTED

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