I did my PPL with a navy bud who was a RAG (FRS) IP. He was an avid GA flyer and had just gotten his CFI-A. I was his first student, and it was an adventure for both of us.
In retrospect, he was pretty much like any other brand-new CFI except I knew his judgement was good. His skills in GA instructing were still developing.
I'm OK with giving mil IP's an FAA ticket, but there really should be more to it than the FOI test (one of the most useless FAA writtens). My main concern is what is going to happen to those early students who face a DPE without ever having been exposed to how things are done in the GA world...I think it comes down Mil IP's simply not knowing what they don't know.
Reverse the situation...could I (a civilian CFI) teach someone to fly a T-34? Sure. Could I teach them to pass NATOPS checks? No, because I've never had anything to do with NATOPS (unless it involved parachuting).