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.
Read more about USS Leader (MSO-490): Pacific Ocean Operations, Cambodia and Vietnam Operations, Market Time Operations, Persian Gulf War Service
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