Aggressive class minesweeper
Encyclopedia
The Aggressive class minesweepers are a class of US-built minesweeper
Minesweeper (ship)
A minesweeper is a small naval warship designed to counter the threat posed by naval mines. Minesweepers generally detect then neutralize mines in advance of other naval operations.-History:...

s. They are designated as MSO (Mine Sweeper Ocean), distinguishing them from the smaller coastal MSCs and inshore MSIs. Minesweeping, or the disposal of naval mine
Naval mine
A naval mine is a self-contained explosive device placed in water to destroy surface ships or submarines. Unlike depth charges, mines are deposited and left to wait until they are triggered by the approach of, or contact with, an enemy vessel...

s by these vessels is performed in different ways:
  • Sweeping proper, with an underwater cable cutting the mooring cables of floating mines, the mines coming to the surface are then destroyed by gunfire
  • Acoustic sweeping, with a towed device producing noise to trigger acoustic mines
  • Magnetic sweeping, with a towed device producing a magnetic field to trigger magnetic mines

To protect them against magnetic mines, the hull of the ship is made of wood.

Besides the US Navy, this class of vessels has also been used by the Belgian Navy
Belgian Navy
The Marine Component of the Belgian Army, formerly the Belgian Naval Force, is the naval service of Belgium.-Early history:The Belgian Navy was created as the Marine Royale in 1831. This force has operated in various forms throughout Belgian history.When after the Belgian Revolution, the country...

 and the Norwegian Navy, among others.

Construction and disposition

Of the 53 constructed for the United States Navy, 10 were built at Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

, 9 at J.M. Martinac Shipbuilding Corp.
J.M. Martinac Shipbuilding Corp.
The J.M. Martinac Shipbuilding Corp. was founded in 1924 by Joseph M. Martinac on the Thea Foss Waterway in Tacoma, Washington. It specializes in the construction of tugs, trawlers, ferries, naval patrol craft and power yachts up to long.-History:...

, Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

, 8 at Wilmington Boat Works Inc., Wilmington, California, 6 at Luders Marine Construction Co. of Stamford, Connecticut
Stamford, Connecticut
Stamford is a city in Fairfield County, Connecticut, United States. According to the 2010 census, the population of the city is 122,643, making it the fourth largest city in the state and the eighth largest city in New England...

, 4 at Broward Marine Inc, Fort Lauderdale, Florida
Fort Lauderdale, Florida
Fort Lauderdale is a city in the U.S. state of Florida, on the Atlantic coast. It is the county seat of Broward County. As of the 2010 census, the city had a population of 165,521. It is a principal city of the South Florida metropolitan area, which was home to 5,564,635 people at the 2010...

, 4 at Martinolich Shipbuilding Co., San Diego, California
San Diego, California
San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

, 3 at Burger Boat Company, Manitowoc, Wisconsin
Manitowoc, Wisconsin
Manitowoc is a city in and the county seat of Manitowoc County, Wisconsin, United States. The city is located on Lake Michigan at the mouth of the Manitowoc River. According to the 2000 census, Manitowoc had a population of 34,053, with over 50,000 residents in the surrounding communities...

, 3 at Colberg Boat Works, Stockton, California
Stockton, California
Stockton, California, the seat of San Joaquin County, is the fourth-largest city in the Central Valley of the U.S. state of California. With a population of 291,707 at the 2010 census, Stockton ranks as this state's 13th largest city...

, 2 at Fulton Shipyard, Antioch, California
Antioch, California
Antioch is a city in Contra Costa County, California. Located in the East Bay region of the San Francisco Bay Area along the San Joaquin-Sacramento River Delta, it is a suburb of San Francisco and Oakland. The city's population was 102,372 at the U.S...

, 2 at Norfolk Naval Shipyard
Norfolk Naval Shipyard
The Norfolk Naval Shipyard, often called the Norfolk Navy Yard and abbreviated as NNSY, is a U.S. Navy facility in Portsmouth, Virginia, for building, remodeling, and repairing the Navy's ships. It's the oldest and largest industrial facility that belongs to the U.S. Navy as well as the most...

 and 2 at Seattle Shipbuilding and Drydocking Co., Seattle, Washington.

33 of the class were decommissioned before the mid-1970s. Four ex-USN ships were sold to the Republic of China Navy
Republic of China Navy
The Republic of China Navy is the maritime branch of the Armed forces of the Republic of China . The ROC Navy's primary mission is to defend ROC territories and the sea lanes that surround Taiwan against a blockade, attack, or possible invasion by forces of the People's Republic of China...

 1994 and re-classed as s. They were still in active service in 2002. was decommissioned September 30, 1994 in Tacoma, Washington and was the last Aggressive class minesweeper in US Navy active service.

General development of minesweeping

Minesweepers have been in operation since World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 and originally involved a simple metal detector
Metal detector
A metal detector is a device which responds to metal that may not be readily apparent.The simplest form of a metal detector consists of an oscillator producing an alternating current that passes through a coil producing an alternating magnetic field...

, which sailors used to locate mines. This practice was dangerous not only from the risk of missing and detonating a mine, but also because the enemy would be making the task harder for the sweepers by keeping them under constant, heavy fire. Minesweepers were greatly admired by their peers because of their bravery.

Aggressive class minesweepers used AN/SQQ-14 mine hunting sonar to locate moored or bottom mines. They used electromagnetic cables to set off mines or other cables to cut their mooring lines, and various magnetic and acoustical devices to set off mines. Toward the end of their use, the class also employed remote submersibles like Super Sea Rover to locate mines.

Today, active minesweepers or minehunters are frequently used. The Royal Navy
Royal Navy
The Royal Navy is the naval warfare service branch of the British Armed Forces. Founded in the 16th century, it is the oldest service branch and is known as the Senior Service...

 of the United Kingdom uses small submarine
Submarine
A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

s that are controlled by wireless operators on board the several minesweeping frigate
Frigate
A frigate is any of several types of warship, the term having been used for ships of various sizes and roles over the last few centuries.In the 17th century, the term was used for any warship built for speed and maneuverability, the description often used being "frigate-built"...

s that it possesses. Sweden produced a robotic Self-propelled Acoustic/Magnetic Minesweeper (SAM), which proved its worth during Operation Desert Storm, when it was successfully used for minesweeping by the US Navy. SAMs are currently in service with the Swedish Navy, the Japanese Navy
Japan Maritime Self-Defense Force
The , or JMSDF, is the naval branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. It was formed following the dissolution of the Imperial Japanese Navy after World War II....

, the Royal Navy and the US Navy, though not necessarily aboard Aggressive class minesweepers.

Units

Ship Name Hull No. Builder Commission–
Decommission
Fate Link
422 Luders Marine Construction Co. of Stamford, Connecticut
Stamford, Connecticut
Stamford is a city in Fairfield County, Connecticut, United States. According to the 2010 census, the population of the city is 122,643, making it the fourth largest city in the state and the eighth largest city in New England...

1953–1971 Sold for scrap 1980 http://www.nvr.navy.mil/nvrships/details/MSO422.htm
423 Luders Marine Construction Co. of Stamford, Connecticut
Stamford, Connecticut
Stamford is a city in Fairfield County, Connecticut, United States. According to the 2010 census, the population of the city is 122,643, making it the fourth largest city in the state and the eighth largest city in New England...

1954-1970 Destroyed by fire, sold for scrapping 1969 http://www.nvr.navy.mil/nvrships/details/MSO423.htm
424 Norfolk Naval Shipyard
Norfolk Naval Shipyard
The Norfolk Naval Shipyard, often called the Norfolk Navy Yard and abbreviated as NNSY, is a U.S. Navy facility in Portsmouth, Virginia, for building, remodeling, and repairing the Navy's ships. It's the oldest and largest industrial facility that belongs to the U.S. Navy as well as the most...

1953-1971 Sold for scrap 1981 http://www.nvr.navy.mil/nvrships/details/MSO424.htm
425 Norfolk Naval Shipyard
Norfolk Naval Shipyard
The Norfolk Naval Shipyard, often called the Norfolk Navy Yard and abbreviated as NNSY, is a U.S. Navy facility in Portsmouth, Virginia, for building, remodeling, and repairing the Navy's ships. It's the oldest and largest industrial facility that belongs to the U.S. Navy as well as the most...

1953-1971 Sold for scrap 1980 http://www.nvr.navy.mil/nvrships/details/MSO425.htm
426 Fulton Shipyard, Antioch, California
Antioch, California
Antioch is a city in Contra Costa County, California. Located in the East Bay region of the San Francisco Bay Area along the San Joaquin-Sacramento River Delta, it is a suburb of San Francisco and Oakland. The city's population was 102,372 at the U.S...

1954-1973 Sold for scrap 1973 http://www.nvr.navy.mil/nvrships/details/MSO426.htm
427 Fulton Shipyard, Antioch, California
Antioch, California
Antioch is a city in Contra Costa County, California. Located in the East Bay region of the San Francisco Bay Area along the San Joaquin-Sacramento River Delta, it is a suburb of San Francisco and Oakland. The city's population was 102,372 at the U.S...

1954-1992 Sold for scrap 2001 http://www.nvr.navy.mil/nvrships/details/MSO427.htm
428 - 431 were US Dash class minesweepers
432 Colberg Boat Works, Stockton, California
Stockton, California
Stockton, California, the seat of San Joaquin County, is the fourth-largest city in the Central Valley of the U.S. state of California. With a population of 291,707 at the 2010 census, Stockton ranks as this state's 13th largest city...

 
1953-1971 Sold or loaned to Spain as Guadalete M41, 1971. http://www.nvr.navy.mil/nvrships/details/MSO432.htm
433 Colberg Boat Works, Stockton, California
Stockton, California
Stockton, California, the seat of San Joaquin County, is the fourth-largest city in the Central Valley of the U.S. state of California. With a population of 291,707 at the 2010 census, Stockton ranks as this state's 13th largest city...

 
1953-1991 Scrapped 2002 http://www.nvr.navy.mil/nvrships/details/MSO433.htm
434 Colberg Boat Works, Stockton, California
Stockton, California
Stockton, California, the seat of San Joaquin County, is the fourth-largest city in the Central Valley of the U.S. state of California. With a population of 291,707 at the 2010 census, Stockton ranks as this state's 13th largest city...

 
1954-1972 Sold to be scrapped 1976, privately held until scrapped by USACE in 1993. http://www.nvr.navy.mil/nvrships/details/MSO434.htm
435 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1954-1972 Sold for scrap 1973 http://www.nvr.navy.mil/nvrships/details/MSO435.htm
436 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1954-1972 Loaned to Philippines 1972
Sold for scrap 1977
http://www.nvr.navy.mil/nvrships/details/MSO436.htm
437 Martinolich Shipbuilding Co., San Diego, California
San Diego, California
San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

 
1955-1970
1971-1991
Sold for scrap 2000 http://www.nvr.navy.mil/nvrships/details/MSO437.htm
438 Martinolich Shipbuilding Co., San Diego, California
San Diego, California
San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

 
1955-1970
1971-1991
Sold for scrap 2000 http://www.nvr.navy.mil/nvrships/details/MSO438.htm
439 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1955-1992 Sold for scrap 2000 http://www.nvr.navy.mil/nvrships/details/MSO439.htm
440 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1954-1993 Sold for scrap 2002 http://www.nvr.navy.mil/nvrships/details/MSO440.htm
441 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1954-1993 Sold for scrap 2002 http://www.nvr.navy.mil/nvrships/details/MSO441.htm
442 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1954-1990 Sold for scrap 1992 http://www.nvr.navy.mil/nvrships/details/MSO442.htm
443 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1955-1989 Sold for scrap 1990 http://www.nvr.navy.mil/nvrships/details/MSO443.htm
444 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1954-1972 Loaned to Philippines 1972
Scrapped 1977
http://www.nvr.navy.mil/nvrships/details/MSO444.htm
445 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1955-1973 Sunk after a fire http://www.nvr.navy.mil/nvrships/details/MSO445.htm
446 Seattle Shipbuilding and Drydocking Co., Seattle, Washington  1954-1992 Scrapped 2002 http://www.nvr.navy.mil/nvrships/details/MSO446.htm
447 Seattle Shipbuilding and Drydocking Co., Seattle, Washington  1955-1972 Sold for scrap 1973 http://www.nvr.navy.mil/nvrships/details/MSO447.htm
448 Martinolich Shipbuilding Co., San Diego, California
San Diego, California
San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

 
1953-1990 Sold for scrap 1993 http://www.nvr.navy.mil/nvrships/details/MSO448.htm
449 Martinolich Shipbuilding Co., San Diego, California
San Diego, California
San Diego is the eighth-largest city in the United States and second-largest city in California. The city is located on the coast of the Pacific Ocean in Southern California, immediately adjacent to the Mexican border. The birthplace of California, San Diego is known for its mild year-round...

 
1954-1991 Scrapped 2002 http://www.nvr.navy.mil/nvrships/details/MSO449.htm
450 - 454 built at Bellingham Shipyards Co., Bellingham, Washington
Bellingham, Washington
Bellingham is the largest city in, and the county seat of, Whatcom County in the U.S. state of Washington. It is the twelfth-largest city in the state. Situated on Bellingham Bay, Bellingham is protected by Lummi Island, Portage Island, and the Lummi Peninsula, and opens onto the Strait of Georgia...

 for France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

, not necessarily Aggressive class ships.
455 Wilmington Boat Works Inc., Wilmington, California  1954-1994 Sold to Taiwan 1994 http://www.nvr.navy.mil/nvrships/details/MSO455.htm
456 Wilmington Boat Works Inc., Wilmington, California  1954-1990 Sold for scrap 1992 http://www.nvr.navy.mil/nvrships/details/MSO456.htm
457 Wilmington Boat Works Inc., Wilmington, California  1954-1972 Sold for scrap 1973 http://www.nvr.navy.mil/nvrships/details/MSO457.htm
458 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1955-1970 Sold for scrap 1976
Donated to Lucid MSO-458 Foundation in 2005 to be restored as a museum ship
http://www.nvr.navy.mil/nvrships/details/MSO458.htm
459 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1955-1970 Sold for scrap 1981 http://www.nvr.navy.mil/nvrships/details/MSO459.htm
460 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1955-1970 Sold for scrap 1971 http://www.nvr.navy.mil/nvrships/details/MSO460.htm
461 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1955-1972 Sold for scrap 1979 http://www.nvr.navy.mil/nvrships/details/MSO461.htm
462 Higgins Corp
Higgins Industries
Higgins Industries was the company owned by Andrew Higgins based in New Orleans, Louisiana, United States. Higgins is most famous for the design and production of the Higgins boat, an amphibious landing craft referred to as LCVP, which were used extensively in D-Day Invasion of Normandy...

., New Orleans, Louisiana
New Orleans, Louisiana
New Orleans is a major United States port and the largest city and metropolitan area in the state of Louisiana. The New Orleans metropolitan area has a population of 1,235,650 as of 2009, the 46th largest in the USA. The New Orleans – Metairie – Bogalusa combined statistical area has a population...

 
1955-1970 Sold for scrap 1978 http://www.nvr.navy.mil/nvrships/details/MSO462.htm
463 Wilmington Boat Works Inc., Wilmington, California  1954-1971 Initially loaned then sold to Spain as Guadalmedina M42, 1974 http://www.nvr.navy.mil/nvrships/details/MSO463.htm
464 Wilmington Boat Works Inc., Wilmington, California  1954-1990 Sold for scrap 1992 http://www.nvr.navy.mil/nvrships/details/MSO464.htm
465 Wilmington Boat Works Inc., Wilmington, California  1954-1958 Grounded and sunk, 1958 in the Naruto Strait
Naruto Strait
is a strait between Awaji Island and Shikoku in Japan. It connects Harima nada, the eastern part of the Inland Sea and Kii Channel. A famous feature of the strait is the Naruto whirlpools. Ōnaruto Bridge, the southern part of Akashi-Kaikyo Bridge crosses over it....

 
http://www.nvr.navy.mil/nvrships/details/MSO465.htm
466 Wilmington Boat Works Inc., Wilmington, California  1954-1970 Sold for scrap 1976 http://www.nvr.navy.mil/nvrships/details/MSO466.htm
467 Wilmington Boat Works Inc., Wilmington, California  1954-1972 Sold for scrap 1976 http://www.nvr.navy.mil/nvrships/details/MSO467.htm
468 Luders Marine Construction Co. of Stamford, Connecticut
Stamford, Connecticut
Stamford is a city in Fairfield County, Connecticut, United States. According to the 2010 census, the population of the city is 122,643, making it the fourth largest city in the state and the eighth largest city in New England...

 
1954-1970 Sold for scrap 1971 http://www.nvr.navy.mil/nvrships/details/MSO468.htm
469 Luders Marine Construction Co. of Stamford, Connecticut
Stamford, Connecticut
Stamford is a city in Fairfield County, Connecticut, United States. According to the 2010 census, the population of the city is 122,643, making it the fourth largest city in the state and the eighth largest city in New England...

 
1955-1970 Grounded at Charleston Harbor then sold for scrap 1970. http://www.nvr.navy.mil/nvrships/details/MSO469.htm
470 Luders Marine Construction Co. of Stamford, Connecticut
Stamford, Connecticut
Stamford is a city in Fairfield County, Connecticut, United States. According to the 2010 census, the population of the city is 122,643, making it the fourth largest city in the state and the eighth largest city in New England...

 
1955-1970 Sold for scrap 1971 http://www.nvr.navy.mil/nvrships/details/MSO470.htm
471 Luders Marine Construction Co. of Stamford, Connecticut
Stamford, Connecticut
Stamford is a city in Fairfield County, Connecticut, United States. According to the 2010 census, the population of the city is 122,643, making it the fourth largest city in the state and the eighth largest city in New England...

 
1950-1970 Sold for scrap 1979, scrapped 1983.http://www.geocities.com/Pentagon/Bunker/2170/mso471_scrapinfo.html http://www.nvr.navy.mil/nvrships/details/MSO471.htm
472 Burger Boat Company, Manitowoc, Wisconsin
Manitowoc, Wisconsin
Manitowoc is a city in and the county seat of Manitowoc County, Wisconsin, United States. The city is located on Lake Michigan at the mouth of the Manitowoc River. According to the 2000 census, Manitowoc had a population of 34,053, with over 50,000 residents in the surrounding communities...

 
1954-1970 Sold for scrap 1971 http://www.nvr.navy.mil/nvrships/details/MSO472.htm
473 Burger Boat Company, Manitowoc, Wisconsin
Manitowoc, Wisconsin
Manitowoc is a city in and the county seat of Manitowoc County, Wisconsin, United States. The city is located on Lake Michigan at the mouth of the Manitowoc River. According to the 2000 census, Manitowoc had a population of 34,053, with over 50,000 residents in the surrounding communities...

 
1954-1972 Sold to Spain as Guadiana M44, 1972. Scrapped by Spain after 1999. http://www.nvr.navy.mil/nvrships/details/MSO473.htm
474 Burger Boat Company, Manitowoc, Wisconsin
Manitowoc, Wisconsin
Manitowoc is a city in and the county seat of Manitowoc County, Wisconsin, United States. The city is located on Lake Michigan at the mouth of the Manitowoc River. According to the 2000 census, Manitowoc had a population of 34,053, with over 50,000 residents in the surrounding communities...

 
1955-1972 Sold for scrap 1979 http://www.nvr.navy.mil/nvrships/details/MSO474.htm
475 - 487 built for France, Portugal, Spain, Belgium and the Netherlands, not necessarily Aggressive class ships.
488 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1955-1970
1971-1994
Sold to Taiwan 1994 http://www.nvr.navy.mil/nvrships/details/MSO488.htm
489 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1955-1994 Sold to Taiwan 1994 http://www.nvr.navy.mil/nvrships/details/MSO489.htm
490 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1955-1970
1971-1991/92
Sold for scrap 1994 http://www.nvr.navy.mil/nvrships/details/MSO490.htm
491 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1956-1971 Initially loaned in 1971 then sold to Spain as Guadalquivir M43 http://www.nvr.navy.mil/nvrships/details/MSO491.htm
492 J. M. Martinac Shipbuilding Corp., Tacoma, Washington
Tacoma, Washington
Tacoma is a mid-sized urban port city and the county seat of Pierce County, Washington, United States. The city is on Washington's Puget Sound, southwest of Seattle, northeast of the state capital, Olympia, and northwest of Mount Rainier National Park. The population was 198,397, according to...

 
1956-1994 Sold to Taiwan 1994 http://www.nvr.navy.mil/nvrships/details/MSO492.htm
493 Broward Marine Inc, Fort Lauderdale, Florida
Fort Lauderdale, Florida
Fort Lauderdale is a city in the U.S. state of Florida, on the Atlantic coast. It is the county seat of Broward County. As of the 2010 census, the city had a population of 165,521. It is a principal city of the South Florida metropolitan area, which was home to 5,564,635 people at the 2010...

 
1956-1966 Caught fire pier side at San Juan, Puerto Rico, sunk 1966. Later raised and sunk as an artificial reef. http://www.nvr.navy.mil/nvrships/details/MSO493.htm
494 Broward Marine Inc, Fort Lauderdale, Florida
Fort Lauderdale, Florida
Fort Lauderdale is a city in the U.S. state of Florida, on the Atlantic coast. It is the county seat of Broward County. As of the 2010 census, the city had a population of 165,521. It is a principal city of the South Florida metropolitan area, which was home to 5,564,635 people at the 2010...

 
1957-1971 Sold for scrap 1978 http://www.nvr.navy.mil/nvrships/details/MSO494.htm
495 Broward Marine Inc, Fort Lauderdale, Florida
Fort Lauderdale, Florida
Fort Lauderdale is a city in the U.S. state of Florida, on the Atlantic coast. It is the county seat of Broward County. As of the 2010 census, the city had a population of 165,521. It is a principal city of the South Florida metropolitan area, which was home to 5,564,635 people at the 2010...

 
1957-1971 Sold for scrap 1978 http://www.nvr.navy.mil/nvrships/details/MSO495.htm
496 Broward Marine Inc, Fort Lauderdale, Florida
Fort Lauderdale, Florida
Fort Lauderdale is a city in the U.S. state of Florida, on the Atlantic coast. It is the county seat of Broward County. As of the 2010 census, the city had a population of 165,521. It is a principal city of the South Florida metropolitan area, which was home to 5,564,635 people at the 2010...

1958-1971 Sold for scrap 1978 http://www.nvr.navy.mil/nvrships/details/MSO496.htm
MSO-497 497 Cancelled, never built

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