John Henry Balch was a United States Naval Reserve officer. He received the Medal of Honor for his actions in World War I.
John H. Balch, Medal of Honor recipient
A hospital corpsman (HM) or corpsman is an enlisted medical specialist of the United States Navy, who may also serve in a U.S. Marine Corps unit. The corresponding rating within the United States Coast Guard is health services technician (HS).
Rating insignia
A corpsman aboard an aircraft carrier in 1999
Hospital steward's service coat, U.S. Army Hospital Corps, 1898
A hospital corpsman draws blood from a patient as part of his duties as an independent duty corpsman