After one convoy escort voyage to Bizerte, Tunisia between 12 April and 3 May 1944, Coffman served between 10 June and 10 July as a target for submarines in training. Assigned to the hunter-killer group formed around USS Card (CVE 11), Coffman joined in training patrols, and a voyage to Casablanca during which the group covered the movement of several convoys. Alternate periods of exercises and patrols continued until early in February 1945 when Coffman was ordered to join a group searching in stormy waters for a German weather ship reported south of Iceland. She returned to screen carriers during air training operations out of Quonset Point, R.I. until April, when the German U-boats made their last great effort of the war, penetrating the eastern Atlantic in strength. Coffman and her division were ordered to a search along the coast of Virginia, and on 30 April, she, with USS Thomas (DE 102), USS Bostwick (DE 103) and USS Natchez (PF 2), sank U-879 in 36°34' N., 74°00' W. After continued service to carriers and submarines in training, Coffman reported to Green Cove Springs, Fla. 15 November 1945, and was decommissioned there 30 April 1946 preparatory to disposal. Following the outbreak of the Korean war she was removed from the sale list and placed in reserve. Coffman was stricken 1 July 1972 and sold 17 August 1973 to be broken up for scrap.