Second World War ‘foo fighter’ reports

Record summary

What happened Allied and Axis aircrews reported luminous balls, fiery discs and lights that paced aircraft, especially during night operations. Pilots initially suspected enemy weapons, but no operational device matching the reports was found. The label ‘foo fighters’ covered many separate observations rather than one phenomenon. Evidence Squadron intelligence reports, aircrew debriefings and wartime press accounts document recurring descriptions. Explanations considered St Elmo’s fire, ball lightning, Venus, tracer fire, flak, reflections, fatigue and enemy aircraft each fit portions of the material. What remains uncertain Combat stress, darkness and secrecy degraded observation quality, and different causes were almost certainly grouped under one nickname. Primary source Second World War ‘foo fighter’ reports — Wikipedia