USS Sustain, a 890-ton Auk class minesweeper built at Cleveland, Ohio, was commissioned in November 1942. After a few months of escorting convoys off the Atlantic coast, she went to the Western Mediterranean in April 1943. Over the next year and a half, Sustain provided escort and minesweeping duties there, and participated in the invasions of Sicily, Salerno, Anzio and Southern France. On 4 May 1944, while escorting a convoy, she helped sink the German submarine U-371. Late in 1944, she returned to the United States and was sent to the Pacific in February 1945. She arrived off Okinawa in June 1945. After the Japanese surrender, Sustain swept mines off Japan, in the East China Sea and off Formosa until leaving for the U.S. early in 1946.

Decommissioned in June 1946, Sustain returned to active service in January 1952. Assigned to the Atlantic Fleet, she operated off the U.S. East Coast and in the Mediterranean. Decommissioned again in February 1955 and redesignated MSF-119, she was again redesignated MMC-2 in 1958. Following conversion to a coastal minelayer, Sustain was transferred to Norway in October 1959. Renamed Tyr, she served in the Norwegian Navy until 1976.