There are documented cases of orange balls following the allied bombers on day missions which was never explained and to which they coined the name "Foo Fighters" and that is not the band either.
There is one story on the P-38 that was hours over due from a mission ~ pilot posted as MIA
then when the tanks were known to be bone dry it appears over the field and P-38 breaks up in mid air no fire as the fuel tanks are dry.
The chute opens and the pilot descends to the ground, crews rush to the scene but he is long dead a single round bullet hole through the forehead......it happened a most strange event
Source ~ Fork Tailed Devil: The P-38 Martin Caidin Pages 368-369