USS Persistent (MSO-491)

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Career (United States)
Name: USS Persistent (AM-491)
Builder: J.M. Martinac Shipbuilding Corp.
Laid down: 17 June 1954
Reclassified: MSO-491, 7 February 1955
Launched: 23 April 1955
Commissioned: 3 February 1956
Decommissioned: 1 July 1971
Struck: 1 August 1974
Fate: sold to Spain, 1 August 1974
Career (Spain)
Name: Guadalquivir (M43)
Acquired: 1 August 1974
Fate: unknown
General characteristics
Class and type: Aggressive-class minesweeper
Displacement: 775 tons (full load)
Length: 172 ft (52 m)
Beam: 36 ft (11 m)
Draught: 10 ft (3.0 m)
Speed: 15 knots
Complement: 74
Armament: one 40mm mount

USS Persistent (AM-491/MSO-491) 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 ship to be named Persistent by the Navy, MSO–491 was laid down 17 June 1954 as AM491 by J.M. Martinac Shipbuilding Corp., Tacoma, Washington; reclassified MSO–491 on 7 February 1955; launched 23 April 1955; sponsored by Mrs. M.S. Erdahl; and commissioned 3 February 1956, Lt. Theodore R. Johnson in command.

West Coast operations[edit]

Following Pacific coast shakedown, Persistent reported for duty to Commander, Pacific Fleet, 2 March 1956 and was designated flagship for Mine Division 91 the same day. In September 1956, she was modified for advanced sound reduction to protect against acoustic mines.

In August 1957, she deployed to WestPac as part of Mine Countermeasures Group, U.S. 7th Fleet. After return to Long Beach, California, for regular overhaul in February 1958 and completion of type training that year, she engaged in research at the Navy Acoustic Range, Puget Sound, September 1959. Later that year she measured ocean currents under assignment to Scripps Institute of Oceanography.

After another deployment to WestPac in 1960, she returned to California in July. After type training in 1961, she deployed to WestPac in January 1962, assisting in the training of South Vietnamese sailors from January to August. After domestic operations in 1963, she deployed annually to WestPac from 1964 to 1970. She returned from her last WestPac early in 1971. Until 1971 she remained active with the U.S. Pacific Fleet.


Persistent was decommissioned on 1 July 1971 and struck from the Navy list on 1 August 1974. In 1974, she was sold to Spain, which named her Guadalquivir (M43).


This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.

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