USS Loyalty (AM-457/MSO-457) was an Aggressive-class minesweeper acquired by the U.S. Navy for the task of removing mines that had been placed in the water to prevent the safe passage of ships. The second warship to be named Loyalty by the Navy, AM-457 was laid down by Wilmington Boat Works Inc., Wilmington, California, 9 November 1951; launched 22 November 1953; sponsored by Mrs. William L. Horton; and commissioned 11 June 1954, Lt. E. W. Riordan in command.