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 NASA to serve as the department's first chair. Later, he produced a computer strategy game called "Buzz Aldrin's Race Into Space" (1993). To further promote space exploration, and to commemorate the 40th anniversary of the first lunar landing, Aldrin teamed up with Snoop Dogg, Quincy Jones, Talib Kweli, and Soulja Boy to create the rap single and video, "Rocket Experience", with proceeds from video and song sales to benefit Aldrin's non-profit foundation, ShareSpace. In 1985, Aldrin proposed a special spacecraft trajectory now known as the Aldrin cycler. His proposed system of cycling spacecraft makes travel to Mars possible using less