Buzz Aldrin on July 20, Aldrin and Armstrong entered "Eagle", and began the final preparations for lunar descent. At 17:44:00 "Eagle" separated from the "Columbia". Collins, alone aboard "Columbia", inspected "Eagle" as it pirouetted before him to ensure the craft was not damaged, and that the landing gear was correctly deployed. Throughout the descent, Aldrin called out navigation data to Armstrong, who was busy piloting the "Eagle". Five minutes into the descent burn, and above the surface of the Moon, the LM guidance computer (LGC) distracted the crew with the first of several unexpected alarms that indicated that it could not complete
Buzz Aldrin test pilot training, which was a prerequisite at the time. On the completion of his doctorate, Aldrin was assigned to the Gemini Target Office of the Air Force Space Systems Division in Los Angeles, working with the Lockheed Aircraft Corporation on enhancing the maneuver capabilities of the Agena target vehicle which was to be used by NASA's Project Gemini. He was then posted to the Space Systems Division's field office at NASA's Manned Spacecraft Center in Houston, where he was involved in integrating Department of Defense experiments into Project Gemini flights. Aldrin's initial application to join the astronaut corps when