She was then transferred to the Military Sealift Command to continue in non-commissioned service as United States Naval Ship USNS Mispillion (T-AO-105), in which capacity she served until 1994.

Mispillion was laid down under Maritime Commission contract on 14 February 1945 by Sun Shipbuilding and Drydock Company, Chester, Pennsylvania.

Servicing in particular the ships of Yankee Station, she transferred over 71 million US gallons (270,000 m3) of fuel before returning to Long Beach on 30 November 1967.

Cruising United States West Coast and Hawaiian waters for the next five months, she conducted coastal operations and exercises in preparation for departing on 11 May 1968 to serve with the Seventh Fleet through the remainder of 1968.

On 10 January 1982, during a routine fuel transfer in the Indian Ocean, Mispillion collided with the United States Navy-contracted tanker Texas Trader.

She was struck from the Naval Register on 15 February 1995 and her title was transferred to the United States Maritime Administration (MARAD) on 1 May 1999 for lay-up in the National Defense Reserve Fleet at Suisun Bay, Benicia, California.