Gemini 8 training, 1960s. US astronaut David R. Scott (born 1932), in full spacesuit, holding a maneuvering unit while suspended in a weightless state during extra-vehicular activity (EVA) training in a C-135 Air Force plane. A replica of the Gemini spacecraft is in the background with another astronaut in a spacesuit. The Gemini 8 mission took place from 16 to 17 March 1966, and was flown by NASA astronauts David R. Scott and Neil A. Armstrong. Because the mission was aborted due to an emergency while in orbit, the planned EVA never took place. Photographed on 18 February 1966.