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 that was a dead end, as it would be Gemini 13 which did not exist; the last scheduled mission in the program was Gemini 12. But the February 28, 1966, deaths of the Gemini 9 prime crew, Elliot See and Charles Bassett, in an air crash, led to Lovell and Aldrin being moved up one mission on March 21 to backup for Gemini 9, which put them in position as prime crew for Gemini 12. They were officially designated its prime crew on June 17, 1966, with Gordon Cooper and Gene Cernan as their backups. Initially, Gemini 12's mission objectives