The UFO (Unidentified Flying Object) phenomenon has been with us for many years now. The term foo fighter was used by Allied aircraft pilots in World War 11 to describe various UFOs or mysterious aerial phenomena seen in the skies over both the European and Pacific Theatre of Operations.
Post war paranoia and the real threat of nuclear strikes gave rise to speculation that secret planes and air weapons were being tested. Their existence was always strenuously denied by the millitary and they insisted that any sightings were due to objects such as high altitude weather balloons, flocks of birds etc.
This gave rise to the possibility that such unidentified flying objects could actually be of extra-terrestrial origin .Science-fiction films of the time were similarly preoccupied with the idea of alien visitations from other worlds … 1951 alone saw The Day the Earth Stood Still, The Man From Planet x, When Worlds Collide, and The Thing From Another World.
Edward J. Ruppelt of the United States Air Force (USAF) coined the word UFO in 1951 and was the head of Project Blue Book. Here are some UFO pictures taken during 1951.
Finally … here is a brief UFO clip courtesy of YouTube. The footage was taken in 1951 in Kentucky ,USA