10 U.S.C. § 711a

Commissioned officers of the Army, Navy, and Air Force may be detailed for duty with the American National Red Cross, by the Secretary of the military department concerned, as follows: (1) for duty with the Service to the Armed Forces Division— (A) one or more officers of the Army Medical Department; (B) one or more officers of the Medical Department of the Navy; and (C) one or more officers selected from among medical officers, dental officers, veterinary officers, medical service officers, nurses, and medical specialists of the Air Force; and (2) to be in charge of the first-aid department— (A) an officer of the Medical Corps of the Army; (B) an officer of the Medical Corps of the Navy; or (C) a medical officer of the Air Force.