USS Implicit (AM-455/MSO-455) 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.
Implicit (AM-455) was launched by Wilmington Boat Works, Wilmington, California 1 August 1953; sponsored by Mrs. Landon Horton, and commissioned 10 March 1954 Lt. Comdr. A. G. Filiatrault in command.
One of a class of new minesweepers constructed entirely of nonmagnetic materials, Implicit conducted shakedown training in California waters during mid-1954. She then began an operational pattern which was to continue for three years: minesweeping exercises, fleet maneuvers, and training cruises in the California-Mexico area. The ship then got underway from her home port, Long Beach, California, 7 August 1957 to join the U.S. 7th Fleet in the strategic Far East. During this deployment, Implicit operated with Japanese ships, Nationalist Chinese minesweepers, and with regular units of the U.S. 7th Fleet on their daily mission of maintaining peace and security in the area. She returned to Long Beach 1 March 1958.