USS Implicit ( AM - 455 ) 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 . West Coast deployment . 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 . Second Far East cruise . Training and readiness exercises out of Long Beach occupied the minesweeper until her second cruise to the Far East . She steamed out of Long Beach 8 January 1960 and during six months in the western Pacific Ocean took part in mine warfare exercises with 7th Fleet ships in the Philippines and off Okinawa . " Implicit " arrived Long Beach after this cruise 17 July 1960 . Participating in joint U . S . - Canadian exercises . Training operations and mine countermeasures drill were carried out until August 1961 , when the veteran minecraft took part in joint American - Canadian mine - sweeping exercises off British Columbia . Supporting Vietnam operations . Returning to Long Beach , the ship prepared for another Far Eastern deployment , this time in support of the American advisory effort in South Vietnam . Sailing 2 January 1962 for this embattled country , " Implicit " first participated in SEATO maneuvers and then moved to various ports in South Vietnam to assist in training officers and men in their struggle against Communist subversion . She returned to Long Beach from South Vietnam 17 August 1962 . Joint exercises with the Taiwanese Navy . " Implicit " resumed a schedule of underway training and fleet exercises out of Long Beach until her next deployment , sailing with her division 3 January 1964 . Stopping at Guam and Midway Island en route , she arrived off Formosa for mine - warfare exercises in March . In May she returned to the Formosa Strait for a second operation , in which the ship acted under a Chinese Nationalist division commander in a demonstration of cooperation and smooth combined operations . Following her second SEATO exercise in the Pacific , " Implicit " resumed to Long Beach 28 July 1964 for a yard overhaul and readiness tactics and training along the coast of California . Supporting Operation Market Time . " Implicit " departed Long Beach 21 September 1965 for the Far East . A unit of Mine Division 91 , she joined the " Market Time Patrol " along Vietnam ' s 1 , 000 - mile coastline to intercept Vietcong men and supplies trying to infiltrate into South Vietnam . Once she was fired on by Vietcong while cruising close to shore and retaliated with her 40mm . and other machineguns . After a 2 - week stopover , " Implicit " departed Kaohsiung , Taiwan , 14 January to continue her " Market Time " patrols into late 1966 . By 15 March she had boarded more than 1 , 000 junks and sampans for inspection . On 22 and 23 March , the minesweeper fired nearly 700 rounds of 40mm . ammunition supporting small South Vietnamese naval craft under fire from enemy shore batteries . On 28 June " Implicit " got underway with a mine division for Long Beach , California , via Guam , Kwajalein , and Pearl Harbor arriving Long Beach , 2 August From 13 to 20 September she participated in minesweeping Operation Eager Angler off Santa ; Rosa Island . " Implicit " joined a carrier task unit for Operation COMPTUEX through December and then continued training operations off Long Beach into 1967 . Decommissioning . " Implicit " was decommissioned 30 September 1994 and handed over to the Taiwanese Navy the same day as " Yung Yang " . She was struck from the Navy List 20 November 1994 . Her ultimate fate is unknown .