Buzz Aldrin while Command Module Pilot Michael Collins remained in lunar orbit. A Presbyterian elder, Aldrin became the first person to hold a religious ceremony on the Moon when he privately took communion. Upon leaving NASA in 1971, he became Commandant of the U.S. Air Force Test Pilot School. He retired from the Air Force in 1972, after 21 years of service. His autobiographies "Return to Earth," (1973) and "Magnificent Desolation" (2009), recount his struggles with clinical depression and alcoholism in the years after leaving NASA. He continued to advocate for space exploration, particularly a manned mission to Mars, and developed the
Buzz Aldrin 18, 1963. This made him the first astronaut with a doctoral degree. Combined with his expertise in orbital mechanics, it earned him his nickname from his fellow astronauts. "From the outset," Walter Cunningham, a fellow member of the 1963 group, recalled, "Buzz was referred to as 'Dr. Rendezvous' because of his obsession with rendezvous in space." Aldrin was aware that it was not always intended as a compliment. Jim Lovell and Aldrin were selected as the backup commander and pilot respectively of Gemini 10. Backup crews usually became the prime crew of the third following mission, but in this case