Who was the only US Astronaut to fly aboard Gemini, Apollo and the STS (Shuttle), including two maiden flights

Question: Who was the only US Astronaut to fly aboard Gemini, Apollo and the STS (Shuttle), including two maiden flights
- Keywords:
  apollo,
  astronaut,
  space
Asked by aamalik to Asif, Laura, Lena, Sean, Viv on 16 Mar 2012.
- Sean Murphy answered on 15 Mar 2012:
  
  Via google: John Young?
- Laura Waters answered on 16 Mar 2012:
  
  I have no idea but it would make a good pub quiz question although I guess you are too young to go to pub quizes!

Question: Who was the only US Astronaut to fly aboard Gemini, Apollo and the STS (Shuttle), including two maiden flights