Why would the RAAF be involved?????
The majority of NASA astronauts are civilians with operational specific qualifications and experience.
Australian NASA Astronaut: Andrew S. W. Thomas Ph.D.
NASA Astronaut
Bachelor of Engineering degree in Mechanical Engineering, with First Class Honors, from the University of Adelaide, South Australia, 1973, and a Doctorate in Mechanical Engineering from the University of Adelaide, South Australia, in 1978.
Honorary Fellow, The Institution of Engineers Australia.