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 in their honor in New York, Chicago, and Los Angeles. An official state dinner that evening in Los Angeles celebrated the flight. President Richard Nixon honored each of them with a presentation of the Presidential Medal of Freedom. This was the beginning of a 45-day "Giant Leap" tour that brought the astronauts to 25 foreign countries and included visits with prominent leaders such as Queen Elizabeth II of the United Kingdom. On September 16, 1969, the astronauts addressed a joint session of Congress. With the Apollo Program coming to an end, Aldrin saw few prospects at NASA, and decided to