Buzz Aldrin propellants, with an expected five and a half month journey from the Earth to Mars, and a return trip to Earth of about the same duration on a twin-cycler. Aldrin continues to research this concept with engineers from Purdue University. In December 2003, Aldrin published an opinion piece in "The New York Times" criticizing NASA's objectives. In it, he voiced concern about NASA's development of a spacecraft "limited to transporting four astronauts at a time with little or no cargo carrying capability" and declared the goal of sending astronauts back to the Moon was "more like reaching for past glory
Edwin Eugene Aldrin Sr. a reservist until he retired from the Air Force Reserve with the rank of colonel on 1 May 1956. He later became a consultant to the manned space flight safety director of the NASA. Aldrin died in San Francisco, California, on 28 December 1974, while he was visiting his daughter there, and was buried in Arlington National Cemetery. He was survived by his sister, two daughters, and son, Buzz Aldrin. His wife Marion suffered from depression and killed herself in 1968. He is commemorated by the Edwin E. Aldrin, Sr. Award, which is presented to an Air Force Institute of