you have to switch registration and everything to PA or keep it FL. it has to be registered in the state that it’s plated to. um if you are still paying PA state taxes since you still live in PA right? if not you shouldn’t need to pay the PA state taxes and you should still be able to get a PA registration and plate. talk with JAG they have answers there and paper work like Affidavits and other good info about registration of vehicles in the military.