Impeccable (AM-320), originally ordered as Brutus (BAM-7) for the Royal Navy, was launched by General Engineering and Dry Dock Co., Alameda, California, 21 May 1943; sponsored by Mrs. Agnes W. Hanson; and commissioned 24 April 1944.

Arriving off the island 24 March in advance of the landing group, the minesweeper began her critical job of sweeping the approach and transport areas.

Impeccable returned to Okinawa 21 August; then in September and November swept the approaches to Wakayama, Japan, in support of occupation operations.

During the months that followed Impeccable remained on the eastern coast, aiding the naval blockade and helping to maintain the U.S. position on the offshore islands.

She drove a sampan ashore off Hungnam 17 November 1952, and fought with Wonsan batteries 20 February 1953 while covering USS Condor AMS 5 in a minesweeping operation.

Her tour in the Korean War ended, Impeccable arrived at Pearl Harbor 31 March and her home-port, Long Beach, California, 10 April 1953.

Impeccable arrived at Astoria, Oregon on 16 August 1955; was decommissioned on 14 October; and entered the Pacific Reserve Fleet at Bremerton, Washington, where she remained until she was struck from the Navy list 1 July 1972 and sold for scrap 1 April 1974.