Chillin,
There are 5 family medicine residencies in the Navy, all at hospitals that have no other residency training programs so you get a very good FP experience...no competition from OB, Surgery, etc.
They are Camp Pendleton, CA, Camp LeJeune, NC (both USMC bases), Pensacola, FL, Jacksonville FL, and Bremerton, WA. All are supposed to be excellent programs though I have no first-hand knowledge of any of them. If you do your internship at any of these hospitals, you have a good chance of training straight through if you apply as an intern.
Again, let me put in a plug for the GMO tour. Especially if you want to do family medicine, going out to do GMO work for a couple of years makes a lot of sense. GMOs essentially function as FP docs, and we get to have some great experiences at the same time. It also allows you a few years after internship to really decide what you want to do with your life. I know quite a few people who changed specialty while out in the fleet, myself included. Best thing I ever did.
Bottom line, though, if you want to train through, FP, IM are very likely to happen for you.
DD