NASA Astronaut Group 3 (nicknamed the "The Fourteen") was a group of fourteen astronauts selected by NASA for the Gemini and Apollo program. Their selection was announced in October 1963. Seven were from the United States Air Force, four from the United States Navy, one was from the United States Marine Corps and two were civilians. Four died in training accidents before they could fly in space. All of the surviving ten flew Apollo missions; five also flew Gemini missions. Buzz Aldrin, Alan Bean, Gene Cernan and David Scott walked on the Moon.
Group 3 was the first to waive the requirement of a test pilot background, though military jet fighter aircraft experience was substituted. This applied to Buzz Aldrin, Bill Anders, Gene Cernan, Roger Chaffee, Walter Cunningham and Rusty Schweickart; all the others were test pilots. On average, its members were younger, slightly taller and heavier than the previous two groups, and better educated.