Arriving Nouméa on 25 December, she remained in that area serving as escort ship until 18 September 1944, when she proceeded to Pearl Harbor for overhaul and training.

Harmon returned to Manus 24 November 1944, and joined the 7th Fleet as a unit of Admiral R. L. Conolly's Luzon Reinforcement Group.

She remained there until August when Harmon was ordered to Mare Island to increase her firepower by replacing her 3-inch (76 mm) guns with 5-inch mounts.

Here she trained with submarines until December, then decommissioned at Green Cove Springs, Florida on 25 March 1947, and joined the Atlantic Reserve Fleet.

Harmon was struck from the Navy Directory on 1 August 1965, and sold to North American Smelting Co., Wilmington, Delaware on 30 January 1967 to be scrapped.