Well, I think you should try to learn as much as possible about computers, do some outside-of-school work, before going toff to the air force. Then go to college and build on your computer knowledge.
As far as jobs go, my brother did computer sciece in UC Berkley, then he got a job with NASA, then in a science research fascility, where he keeps up networks and databases. As far as you get a good education, you can go to pretty much any field that you like. I think a position in NASA computer engineer is really cool, or a game designer. All depends on what you like.