World War II, 1945

Following shakedown training in Chesapeake Bay, Vinton sailed via the Panama Canal zone for the Central Pacific and arrived at Pearl Harbor on 16 April. She conducted training exercises in the Hawaiian operating area for a month and one-half before she weighed anchor on 30 May and got underway for the Marianas. Two days out, the attack cargo ship was called upon to perform an errand of mercy when an ailing seaman from the submarine Silversides (SS-236) was transferred via Gato (SS-212) to Vinton for an emergency appendectomy. By the time the attack cargo ship arrived at Guam on 13 June, the submariner had recovered sufficiently to rejoin his ship.

Vinton remained at Guam until 25 June, when she headed for the Western Carolines. She arrived at Ulithi the next day, pushed on for the Ryukyus on 9 July, dropped anchor off Okinawa on the 13th and began unloading her cargo. Despite frequent kamikaze alerts and a typhoon evasion maneuver, her crew bent to the task of making inroads into the mountains of cargo in her holds. Returning to Ulithi on the 28th, Vinton departed the Western Carolines on the 30th and arrived at Pearl Harbor on 6 August. Slightly over a week later, the war was over. Japan — under the staggering weight of two atomic bombs and American armadas which ranged off her shores virtually unchallenged and unchecked — surrendered unconditionally by 15 August.

Post-war activities, 1945–1946

On 22 September, Vinton commenced her post-war operations supporting the fleet and its bases with cargo lifts to Tinian; Guam; Subic Bay, Philippine Islands; Manus, in the Admiralties; Batavia, Java; and Biak, New Guinea, before she returned to Manus en route home. Departing the Admiralty Islands on 17 January 1946, the attack cargo ship arrived at San Francisco on 5 February. Departing San Francisco Bay on 24 February, bound for the east coast, Vinton steamed via the Panama Canal and arrived at New York on 15 March.

Decommissioning and fate

Vinton was decommissioned on 16 March 1946 for return to the War Shipping Administration the following day and laid up in the James River Group of the reserve fleet at Lee Hall, Virginia. She was struck from the Navy List on 5 June 1946.

On 28 November 1946, the ship was withdrawn from reserve and taken to Bethlehem Steel Shipyard in Baltimore, Maryland for conversion to a civilian configuration. She was initially sold 20 November 1947 to Lykes Brothers Steamship Co, but was resold the next day to the Gulf and South American Steamship Co. On 23 September 1964 and entered mercantile service as SS Gulf Shipper. American President Lines, Inc., purchased the erstwhile attack cargo ship and renamed her SS President Harding on 23 September 1964. Subsequently, her ownership changed again on 29 September 1966, when she was purchased by the Pacific Far East Lines and renamed SS America Bear (Pacific Far East had another ex-AKA in their fleet as America Bear from 1961 to 1963. That ship was the former USS Tyrrell). On 10 March 1969, the Columbia Steamship Company purchased the vessel for use in the Pacific freight trade and renamed her SS Columbia Beaver in which livery she served until 22 November 1971 when she was sold for the last time to Long Jong Industries of Taiwan and subsequently scrapped.