Calhoun served in various assignments until 1915 when he qualified as a
submariner. He then commanded a
submarine division; served on the
battleships and ; commanded the
destroyer from 1921 until it ran aground in the 1923
Honda Point Disaster; and commanded a destroyer division. His shore assignments between 1915 and 1937 included service as Inspector of
Ordnance at
Mare Island Naval Shipyard, training at the
Naval War College, and duties at the
San Diego Naval Base. From about 1937 to about 1939 he served as
Commanding Officer of the battleship . From December 1939 he served as Commander Base Force, Pacific Fleet. On 27 February 1942 his title changed to Commander Service Force, Pacific Fleet (
ComServPac). He served in this capacity until the 13 March 1945 when he was assigned to command the
South Pacific Area. He served in this capacity until October 1945. ==Retirement==