The best way to get high launch frequency for a crewed rocket is to have it launch on top of an existing, heavily-used uncrewed rocket. Falcon 9 and Atlas 5 ar

The best way to get high launch frequency for a crewed rocket is to have it launch on top of an existing, heavily-used uncrewed rocket. Falcon 9 and Atlas 5 are two examples. NASA's safety advisory board has said very positive things about the safety aspects of using a frequently-launched rocket.