Foo Fighter (over wing)

This is just one of many photos of “foo fighters” taken by pilots during the war. This particular photo was taken over Germany. These inexplicable spheres and discs of light were reported to be seen flying in formation, sometimes in what appeared to be mock battle or simply tailing squadrons of fighters. At the time, many military experts believed them to be advanced German flying machines or some kind of new weaponry, yet the “foo fighters” never attacked allied aircraft.

Sources: Rense, foofighters.greyfalcon