Buzz Aldrin shot down two MiG-15 aircraft. After earning a Sc.D. degree in astronautics from the Massachusetts Institute of Technology, Aldrin was selected as a member of NASA's Astronaut Group 3, making him the first astronaut with a doctoral degree. His doctoral thesis was "Line-of-Sight Guidance Techniques for Manned Orbital Rendezvous", earning him the nickname "Dr. Rendezvous" from fellow astronauts. His first space flight was Gemini 12 during which he spent over five hours on extravehicular activity (EVA) outside the spacecraft. Aldrin set foot on the Moon at 03:15:16 on July 21, 1969 (UTC), nine minutes after Armstrong first touched the surface,
Buzz Aldrin return to the Air Force. During his NASA career, he had spent 289 hours and 53 minutes in space, of which 7 hours and 52 minutes spent was in EVA. He hoped to become Commandant of Cadets at the United States Air Force Academy, but this job was given to his West Point classmate Hoyt S. Vandenberg Jr. Aldrin was assigned as Commandant of the USAF Aerospace Research Pilot School at Edwards Air Force Base, California, on July 1, 1971. Aldrin had neither managerial nor test pilot experience, but a third of the training curriculum was devoted to astronaut training,