SS J. S. Cullinan was laid down under a Maritime Commission contract (MCE hull 1963) on 5 October 1943 at Houston, Texas, by the Houston Shipbuilding Co.; launched on 13 November 1943; acquired by the Navy and placed in temporary commission as Alderamin (AK-116) on 25 November 1943; proceeded to Mobile, Alabama, and decommissioned on 29 November 1943 to undergo conversion for naval service as a cargo ship; and recommissioned at Mobile on 3 April 1944. Following shakedown training in the Chesapeake Bay, Alderamin sailed to New York City to load cargo for transportation to the Pacific Ocean. The vessel made a port call at Guantanamo Bay, Cuba, before transiting the Panama Canal and reporting to the U.S. Pacific Fleet on 28 May. She departed the Panama Canal Zone the next day and proceeded independently to Espiritu Santo, New Hebrides.

The vessel arrived there on 28 June and began operations with Service Squadron 8, Service Force, Pacific Fleet, as an interisland cargo transport. Among her ports of call were Suva, Fiji Islands; Noumea, New Caledonia; Guadalcanal, Bougainville, Tulagi and Green Island, Solomon Islands; Russell Islands, Treasury Islands; Manus, Admiralty Islands; Wellington, New Zealand; Eniwetok, Marshall Islands; Iwo Jima, Bonin Islands; Guam, Mariana Islands; and Ulithi, Caroline Islands. Alderamin was moored at Okinawa Island at the time of the Japanese capitulation on 15 August 1945. Sailor Nathan Underwood remembered the day the war ended while he was anchored at Okinawa. He said "You could walk on the bullets in the air" during the celebration. She got underway two days later to return to the United States.

The vessel made port calls at Eniwetok and Pearl Harbor, Hawaii, before arriving at San Francisco, California, on 22 September. She sailed once again on 24 October, bound for Shanghai, China. She touched at Pearl Harbor, Guam, and Samar, Philippine Islands, before reaching Shanghai on 8 December. After taking on military personnel for passage back to the United States, Alderamin got underway again on the 11th. On 1 February 1946, she arrived back at San Francisco and debarked her passengers. She then began preparations for deactivation. Alderamin was decommissioned on 10 April 1946 and was delivered to the War Shipping Administration for disposal. Her name was struck from the Navy list on 1 May 1946. The ship was later scrapped.

• This article incorporates text from the public domain Dictionary of American Naval Fighting Ships. The entry can be found here.

• Photo gallery of Alderamin at NavSource Naval History