> There is some amount of expectation that the rocket will blow up before they get in to space. Nobody wants it, but they are the best of us and they are courageous as heck.
The B-17 aircrews in WW2 knew they had only a 20% chance of surviving their mission count intact. (not killed, crippled, or POW'd)
Neil Armstrong figured he only had a 50% chance of surviving Apollo 11. Personally, I think he was optimistic.