I thought about joining the USAF Some years back but decided not too. However I was able to find a Rabbi who was serving in the Air Force (Go to the chaplaincy web page dig around a bit). From what he said it can be done but it is hard. The main thing you will have to keep in mind is that the “Needs of the Service” come first. So if they need you in Minot AFB (Minot ND) and you are the only Frum person for 500 miles well you won’t have much of a life.
That being said I would suggest you find someone in the Air Force to talk to instead of the folks here who probably don’t know much.
Good luck with whatever you decide!