reporting of the Kenneth Arnold incident. "Unidentified flying object" (UFO) has been in-use since 1947. The acronym "UFO" was coined by Captain Edward J. Ruppelt for the USAF. He wrote, "Obviously the term 'flying saucer' is misleading when applied to objects of every conceivable shape and performance. For this reason the military prefers the more general, if less colorful, name: unidentified flying objects. UFO".

The term UFO became widespread