A medic
Letterman Army Hospital was created in 1898.
Letterman Army Hospital ended in 1994.
A Surgeon. The head doctor at division is the Division Surgeon, the head doctor at corps is the Corps Surgeon, a doctor who treats aviation personnel is a Flight Surgeon and the head doctor in the Army is the Surgeon General of the Army. They call them Surgeons instead of Doctors because the medics we have out in the units are nicknamed "Doc."
Percy Jones Army Hospital was created in 1942.
Ireland Army Community Hospital was created in 1957.
Mobile Army Surgical Hospital ended in 2006.
Mobile Army Surgical Hospital was created in 1945.
York U.S. Army Hospital was created in 1862.
Dark Cut
You can join Indian Army as a doctor. For this you must apply for it.
Army of Ghosts (two part season finale)
No. All US Army doctors must be licensed and board certified. However, according to longstanding Army regulations, soldiers and their family members may be treated at US Army hospitals by a DVM (Doctor of Veterinary Medicine).