"Gallup" continued to operate out of Sasebo, making escort, patrol, and guide tours to Pusan, Wonsan, and Chongjin, Korea, and to Sangley Point and Subic Bay on Luzon in the Philippine Islands. She helped in the bombardment of Wonsan from 23 through 25 February 1951 as United Nations forces seized the harbor islands, and then served as harbor entrance control vessel and "flycatcher," in the latter role patrolling against enemy small boats, combat swimmers, and suicide attack craft. Returning to Yokosuka on 14 March 1951, she entered dry dock there for extensive hull repairs. Returning to Korea, she continued similar duty off the Korean coast until she returned to Yokosuka on 6 October 1951.