Reverting to her original name, "Gallup" lay idle in the Pacific Reserve Fleet at Yokosuka until recommissioned on 18 October 1950 for service in the Korean War, with Lieutenant Commander William W. Boyd, Jr. in command. After shakedown off Sagami Wan, Japan, she got under way with "Bisbee" on 23 November 1950 for Hungnam, Korea. There she relieved her sister ship as harbor entrance control vessel, escorting ships when directed, guarding the channel against unfriendly ships, preventing friendly vessels from entering mined areas, and performing search and rescue services for the many refugees flooding through the area.