The military is actually where PA's originated (kind-of) based on the medical experience of military corpsmen after vietnam. In anycase, yes, all branches of the military use PA's and are happy to speak with you if you are already a PA or a PA student. Also, there is a tri-service PA program that trains military PA's - at which I am currently getting ready to start the third week of the first year. A very intense experience to say the least.