I don't know THAT much about how the military classifies individuals in terms of "retired". Certainly, I have relatives that retired from the military after putting in some 25+ years of service, collecting a pension, etc. However, there are others that say, do their 4 years, perhaps sign up to do another tour, but then have some time off, go back and do another tour, etc. There must be some "optional" contractural paperwork at the end of each tour of duty that they can sign that keeps them "on reserve" in some capacity, and they are no longer "active" status, but "retired" status, but are still able to be called up in time of need, keeping their rank, and so on. I say "optional" in the sense that most people put in their 4 years and are done with it, and I've never heard them (my co-workers that were in the military) say "I'm retired military". I don't know.