to the temporary rank of Captain on July 1, 1918. Interwar period Greenslade was appointed Commanding officer of protected cruiser USS Galveston in March 1919 and participated in the transports of British-American troops from Harwich to Murmansk, USSR as part of Allied intervention in the Russian Civil War there. The Galveston was then transferred to the Black Sea and took part in the evacuation of refugees American Red Cross officials from Novorossiysk and Feodosia to Constantinopol. In March 1920, Greenslade was ordered to the Indian Head, Maryland, where he was appointed inspector of Naval ordnance and officer-in-charge of the Naval Proving Ground and Naval Powder Factory. He served in this capacity until June 1923, when he was appointed commander of Mine Squadron 1, United States Fleet, operating in the Atlantic. Greenslade was ordered to the Naval War College at Newport, Rhode Island, in July 1925, where he completed Senior course one year later. He was subsequently attached to the staff of the Naval War College under Rear admiral William V. Pratt as operations officer. By the end of June 1928, Greenslade was ordered to San Francisco, California, where he assumed command of USS Pennsylvania operating with the Pacific Fleet. He served aboard Pennsylvania until May 1929, when he was appointed chief of staff of the Battleship Division, United States Fleet, under Rear admiral Lucius A. Bostwick. Greenslade was ordered to Washington, D.C. in December 1930 and appointed a member of the General Board of the Navy. Greenslade was promoted to Rear admiral on May 1, 1932, and assumed command of Submarine Force, United States Fleet and was responsible for administration of all submarines for two year, when he returned to the General Board of the Navy. After two-year tour in that capacity, Greenslade assumed command of Battleship Division 2, Battle Force in January 1937. He was promoted to the temporary rank of Vice admiral on January 29, 1938, and assumed command of Battleships, Battle Force, United States Fleet. World War II Greenslade completed his tour in June 1939 and reverted to his permanent rank of rear admiral. He was subsequently attached back to the General Board of the Navy and President Franklin D. Roosevelt personally selected him for the special board for selection of sites for new naval bases in British possessions in exchange for fifty U.S. destroyers in a lend-lease program. In April 1941, Greenslade was ordered to Mare