Robert D. Siegel is an American firefighter.
 Springer, retired American astronaut and test pilotRobert L
 Cenker, American aerospace and electrical engineer, aerospace systems consultant, and former astronautRobert Crippen, American retired naval officer and aviator, test pilot, aerospace engineer, and retired astronautRobert Curbeam, former NASA astronaut and captain in the United States NavyRobert L

