NASA chose to train scientists to be astronauts for the later moon missions: https://en.wikipedia.org/wiki/NASA_Astronaut_Group_4 https://en.wikipedia.org/wiki

NASA chose to train scientists to be astronauts for the later moon missions: https://en.wikipedia.org/wiki/NASA_Astronaut_Group_4 https://en.wikipedia.org/wiki/NASA_Astronaut_Group_4