Project Mercury astronaut Gordon Cooper claimed that in 1957, while stationed at Edwards Air Force Base, his camera crew filmed a disc-shaped craft that landed on a dry lakebed, extended landing gear, and then took off. Cooper said the film was developed on site, showed a clearly defined saucer-shaped craft, and was immediately confiscated and sent to Washington. He was ordered never to speak about it. Cooper later wrote to the United Nations calling for an international investigation, stating: 'I believe that these extra-terrestrial vehicles and their crews are visiting this planet from other planets.' He also reported observing green orbs during his Mercury flight in 1963.