As one of the 7 astronauts of NASA, Cooper piloted the final space mission of Project Mercury in 1963.
He claimed to have spotted UFOs at high altitude in formation when he was flying with the U.S. Air Force in Germany in 1951. He said in an interview in 1996 with Yolanda Gaskins on Paranormal Borderline that the UFOs were higher and travelled faster than terrestrial aircraft at that time.
He filed a report about his sighting and got an answer months later in which he described as illogical. It was stated in the response that the UFOs he spotted were most likely high-flying seed pods.
In 1957, he was with his military crew when they recorded footage of a saucer-shaped UFO that landed on a dry lake bed with three landing legs. It suddenly took off as they tried to approach it. They sent the film to their superiors but never got an update about it.
Cooper also said that his commercial pilot friends told him that they have seen unidentified flying objects.
Mitchell is the sixth person to walk on the moon in 1971 when he flew in Apollo 14. He said in an interview with WPTV that aliens have been watching mankind and the government has been aware about it. He added they have seen UFOs all the time.