LST-731 was laid down on 27 December 1943 at Pittsburgh, Pennsylvania, by the Dravo Corporation of Neville Island; launched on 12 February 1944; sponsored by Mrs. A. J. Ackerman; and commissioned on 30 March 1944.
During World War II, LST-731 was assigned to the Asiatic-Pacific theater and participated in the following operations: capture and occupation of Guam (July and August, 1944), and assault and occupation of Iwo Jima (February and March, 1945). Following the war, LST-731 was redesignated hospital ship LSTH-731 on 15 September 1945 and performed occupation duty in the Far East until mid-February, 1946. She was decommissioned on 2 June 1950 and redesignated LST-731 on 6 March 1952. The ship received the name USS Douglas County (LST-731) on 1 July 1955 and was struck from the Naval Vessel Register on 1 November 1958. Her final fate is unknown. LST-731 earned two battle stars for World War II service.