Foo Fighters - UFO or Secret Weapon?

During WWII pilots reported to have seen a phenomenon of fast-moving, glowing lights that appeared to follow their aircraft.  These objects flew in formation and behaved as if under intelligent control, however they could not be outmaneuvered or shot down.  They would come to be known as Foo Fighters.At the time, Foo Fighters were thought to be secret weapons employed by the enemy, not only was there no support for this claim, but it was later found that German and Japanese pilots had reported similar sightings (honestly, if it were a secret, would they have known about?).  What is evident is that Foo Fighters were widely seen and during that time period, the term was commonly used to describe any UFO sighting, and had the term "flying saucers" had been popular in 1943-1945, these objects would have been so labeled.


So, what did they really see?  Were they extraterrestrial objects, sent during the war to keep an eye on things?  And if it were now, would the military just call it Post Traumatic Stress Syndrome, their new answer for everything? I just find it interesting that with our current technology, people are less receptive of the unknown, than they were when man first spread his wings and conquered the skies.  Maybe as we become advanced there is a certain part of us that comes to admit that we might not be alone.
Please take the time to tell me what you think, leave a comment so I know you were here.