Which president was the only one to have officially reported a UFO sighting?

President James (Jimmy) Carter saw and reported a UFO in the early seventies when he was governor of Georgia or a candidate for that office, he filled out a full statement and added he was a Naval Academy Graduate and was trained in Nuclear Physics as applied to the Submarine service.-hardly a (Little green men) type of observer. The UFo was sighted near the Lions" club in Atlanta, Georgia and could not have been a known type of aircraft.