I'm a retired Navy Medical Service Corps officer so I have some knowledge about this field. Active duty presents a very narrow opportunity in this specialty as all the military services have very small numbers of physicial therapy officers who are principally involved with department adminisitrative or perhaps training tasks. As I recall, career potential, at least in the Navy, was limited. Most physical therapist officers I encountered couldn't get above O-4 unless they got a graduate degree in business or health care administration and then branched to more general higher level adminstrative positions.
The actual "hands-on" work is done by enlisted techs in military health care facilities. If the hands-on work is your passion, the civilian workplace might be your best venue.