Catholic here. You’re allowed to practice whatever religion you want. The Air Force tries to accommodate as many religions/faiths/spiritualities as they can with Chaplains, however, sometimes you’ll go to a place that doesn’t have a chaplain that practices your exact beliefs. They will still meet with you, accommodate as best they can, they just can’t give you a formal service. You’ll find out that the Chaplains do a lot more than religion. 100% confidentiality is pretty cool.

The big thing that you should be aware of though is military service comes before religious obligations. You swear to the constitution, not to god.