Well, you're right that it's no good without trust.
Is there something specific which is driving her behavior? AIT is advanced individual training, yes? So - are you deployed (I don't honestly know, just curious)? How long are you out/away (if at all)?
Anyway, the point I am making is, if you haven't done anything, then this sort of behavior is not only troubling on its face, it's also because unfounded lack of trust can sometimes mean the other person is doing things and is projecting.
Have you tried couples counseling? Your base should have something - this is far from the first time anything like this has ever happened.