LST-742 was laid down on 12 March 1944 at Pittsburgh, Pa., by the Dravo Corp., Neville Island; launched on 22 April 1944; sponsored by Mrs. Harry Lester; and commissioned on 23 May 1944, Lt. Warren W. Holmes, USNR, in command.
During World War II, LST-742 was assigned to the Asiatic-Pacific theater and participated in the following operations:
Lingayen Gulf landing—January 1945
Visayan Island landings—March and April 1945
Tarakan Island operation—April and May 1945
Following the war, LST-742 was decommissioned on 26 April 1946 and transferred to the United States Army on 28 June 1946. She was returned to the United States Navy and recommissioned on 1 September 1950. On 1 July 1955, she was redesignated Dunn County (LST-742) after counties in North Dakota and Wisconsin. The ship performed service during the Korean War followed by extensive service with Amphibious Force, U.S. Pacific Fleet, until decommissioned and struck from the Navy list on 1 February 1961. Dunn County (LST-742) was sold to Zidell Explorations, Inc., of Portland, Oreg., on 6 September 1961.
LST-742 earned three battle stars for World War II service and five battle stars for the Korean War.