Space Rocket History #124 – Apollo: Astronaut Selection and Training – Part 2
With Group 4, for the first time, the selection criteria did not include a requirement for test pilot proficiency. Selectees who were not qualified pilots would be assigned to the Air Force for a year of flight training. The primary scientific requirement was a doctorate in medicine, engineering, or one of the natural sciences.
Astronaut Group 3
Astronaut Group 4
Scientist-Astronaut Harrison Schmitt