US Navy service
Jamaica was delivered to the War Shipping Administration (WSA) on 24 March 1942 at New Orleans under bareboat charter. Todd Pacific Shipyards of Galveston, Texas converted her for Navy use. She was renamed USS Ariel and commissioned at Galveston on 14 May 1942 with Captain E.P. Hylant as her commander.
On 25 May Ariel sailed for Norfolk, Virginia where she joined Service Squadron 7, Service Force, Atlantic Fleet. Over the next 18 months Ariel operated along the east coast and made numerous voyages to ports in the Caribbean including Bermuda, Trinidad, San Juan, Puerto Rico, Havana and Guantánamo Bay, Cuba.
In 1943 Ariel sailed to Iceland; leaving New York City on 15 August and reaching Reykjavík on 24 August. She returned to the east coast, arrived back at New York City on 7 September, and resumed her supply service to the Caribbean.
On 4 January 1944 the store ship left Norfolk, in convoy to the Mediterranean Sea. She called at Algiers, French Algeria on 24 January and soon sailed for Naples, Italy, where she unloaded supplies. She then sailed east and called at Oran, Algeria, in early February before sailing back across the Atlantic reaching New York City on 13 February.
Ariel sailed for the Caribbean on 20 February and called at St. Thomas, Virgin Islands, and San Juan, Puerto Rico, to unload. She then returned to New York. In late March, she commenced another voyage to Iceland and arrived back at New York on 10 April. After a few weeks of upkeep, Ariel sailed for the United Kingdom. On arrival she provided food and supplies to ships preparing for the cross-channel Invasion of Normandy. She operated from the ports of Clyde, Scotland; Belfast, Northern Ireland; and Plymouth and Portland Harbour, England. She left England on D-Day, 6 June, and returned to the United States.
Ariel reached New York on 16 June. After a fortnight of leave and upkeep she sailed to Norfolk. On 1 July she set out across the Atlantic to resupply Mediterranean ports. She unloaded stores and equipment at Oran and Naples before returning to the United States via a stop in the Azores, reaching New York on 3 August.
After a week in New York, Ariel made a round trip to supply Guantanamo Bay and Trinidad. In September she made a round trip from New York to Bermuda. On 20 September she sailed from Norfolk, VA to Oran and Naples. Her return voyage was to New York, where she arrived on 23 October. From there she took supplies to San Juan and Guantanamo Bay. In early November she returned to Norfolk for servicing. She returned to duty on 10 December, sailing laden for Oran and Naples. She returned to Norfolk on 6 February 1945. Later that month she made another round trip to Oran.
In March Ariel left New York for San Juan, Puerto Rico. She returned to the east coast and put into Boston, Massachusetts, on 12 April. From there she took a cargo to Argentia and arrived back at Boston in late April. She then took a cargo to Bermuda.
She continued her supply runs to Caribbean ports from New York, Norfolk, and Boston until 1946. On 12 May 1946 Ariel left New York for a final voyage to Reykjavík, where she docked on 29 May. She left for New York on 1 June, arrived a week later, and entered New York Naval Shipyard for decommissioning.
On 21 June 1946 Ariel was decommissioned at New York and transferred to the War Shipping Administration. Her name was struck from the Navy list on 3 July 1946 and returned to the United Fruit Company, under charter under her pre-war name Jamaica.
