Corpsman

noun

1. An enlisted person in the US Navy, serving either with the Navy or the Marines, who has been trained to give first aid and basic medical treatment, especially in combat situations.
2. A member of a government-sponsored group designated as a corps.

   "Peace Corpsmen."

3. An enlisted person in the U.S. Navy who works in a hospital.
4. An enlisted person in the U.S. Army who works as a field medic.