Originally Posted by Hellmark
I've never quite got the naval basis for space travel. Space Travel done by the major governments is done by the airforce.
US space travel is primarily done by civilians.
The US Navy has a space command, and many astronauts come from the Navy aviation community. As mentioned, Navy experience with systems like life support, power, and with factors like long duration missions in hostile environments, is extensible to space systems.
There is no particular reason that space should be the domain of the Air Force any more that it should be of the Navy, if it's going to be under the armed forces at all. An Air Force operates in the air, dependent on oxygen, gravity, etc, for it's planes to function. What's that got to do with space?