NASA Astronaut Group 3 experience was substituted. This applied to Aldrin, Anders, Cernan, Chaffee, Cunningham and Schweickart; all the others were test pilots. NASA Astronaut Group 3 Astronaut Group 3 was a group of fourteen astronauts selected by NASA. Their selection was announced in October 1963. Four died in training accidents before they could fly in space. All of the surviving ten flew in the Apollo program; five also flew Gemini missions. Aldrin, Bean, Cernan and Scott walked on the Moon. They are the only ones of the first 19 NASA astronaut groups to have no members at all fly on the Space Shuttle.
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