Following shakedown and training exercise along the California-Washington coast, Greiner sailed for Pearl Harbor, reaching there on 31 October 1943. A series of training and patrol operations kept her in the Hawaiian area until 23 December, when she sailed for recently won Tarawa as flagship of Escort Squadron 28 (EscSquad 28). Greiner spent virtually a year in the Gilbert Islands-Marshall Islands area, as the great American island offensive swept westward toward Japan. The ship performed a variety of tasks, including the most important job of escorting transport vessels to the assault areas. She rescued 13 men from a downed PBM Mariner on 26 January 1944, and shelled Kusaie in the Caroline Islands, in reply to a salvo from Japanese batteries, on 1 June.
Greiner spent 3 months at Pearl Harbor for repairs and operations from July–October, and after antisubmarine exercises in Hawaiian waters spent December patrolling around Wotje, Mili, Jaluit, and Maloelap, "leapfrogged" earlier in the war. She spent the remainder of the war in the Gilberts and Marshalls plane-guarding and screening escort carrier forces, except for a short voyage to Okinawa 29 June-3 July 1945.
She decommissioned at Oakland, California on 19 November 1945 and was stricken from the Naval Vessel Register on 5 December. The ship was subsequently sold to J. G. Berkwit & Co. on 10 February 1945, and resold in 1947.
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