The term foo-fighter (English neologism composed of French word feu , Fire and fighter , Equipment for hunting) was coined after the Second World War to describe sightings of strange lights in the sky forms that many pilots had made. The first report of such phenomena came from some of the pilots Squadriglia Caccia by dell'USAF (United States Air Force) 415 in 1944 which claimed that claimed that these objects were launched against them by German airplanes. This was essentially what we today call UFO sightings .
Descriptions of the foo-fighters were reported generally distinguished into three types:

• red ball that are posed to the wings of the aircraft remain behind;

• groups of three balls of fire in single file that followed or preceded the air;

• formations of some fifteen points of light who followed dell'USAF apparatus at a distance;

After the war, will disappear too foo-fighters, at least from Europe: they were in fact reported sightings in the Far East and Pacific archipelago described as a spherical bright red, orange or white and seemingly harmless. The phenomenon of foo-fighters were seen in subsequent years as a "first taste" the wave of sightings that occurred in 1947 in the United States.