218 BC, During the wintertime in the war between the Carthaginians and Rome, Livy recorded "portents", including navium speciem de caelo adfulsisse ("A phantom navy was seen shining in the sky" or "a spectacle of ships gleamed in the sky” depending on the translation.)
So if you identify a UFO as a UFO, it becomes an FO, unless it has landed...then its just an O.
S 34° 07.891′ E 138° 55.696′