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USS Leader (MSO-490)
USS ''Leader'' (AM-490/MSO-490) 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.
''Leader'' (''AM-490'') was laid down by J. M. Martinac Shipbuilding Corp., Tacoma, Washington, 22 September 1953; launched 15 September 1954; sponsored by Mrs. Norman Wordlund; reclassified ''MSO-490'' 7 February 1955, and commissioned 16 November 1955, Lt. Comdr. Harvey E. Toponce in command. This MSO class of minesweeper was constructed of non-magnetic materials, including a wooden hull and aluminum engines, and had a degaussing system to reduce the magnetic field of the vessel, so that it could move over magnetic mines without detonating them. It was equipped with a "magnetic tail", two thick cables spooled on a large reel aft of the superstructure. The power-generation system could send current through this split tail after it was streamed behind the ship, creating a magnetic field designed to set off magnetic mines after the ship passed over them. It carried conventional mine-sweeping gear as well.
== Pacific Ocean operations ==
After shakedown, ''Leader'' joined Mine Squadron 9 at Long Beach, California, 21 December. During 1956, she performed mine evaluation exercises and tactical training until 1 October when she departed on her first WestPac cruise. Arriving Yokosuka 30 October, she operated with the U.S. 7th Fleet for the next 5 months performing mine warfare exercises in the Far East. Returning home 12 April 1957, the minesweeper resumed mine evaluation tests along the U.S. West Coast; and she continued these operations for the next 2 years.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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