Aggressive-class minesweeper

The Aggressive-class minesweepers are a class of US-built minesweepers. They are designated as MSO (Mine Sweeper Ocean), distinguishing them from the smaller coastal MSCs and inshore MSIs. Besides the US Navy, this class of vessels has also been used by the Belgian Navy and the Norwegian Navy, among others.

USS Constant (MSO-427) in 1988
Class overview
NameAggressive class
Operators
  •  United States Navy
  •  Republic of China Navy
  •  Belgian Navy
  •  Royal Norwegian Navy
  •  Royal Netherlands Navy
  •  Philippine Navy
SubclassesOnversaagd class
In commission1953–Present
Completed53
Active1
Retired52
Preserved2
General characteristics
TypeMinesweeper
Displacement853 tons (full load)
Length172 ft (52 m)
Beam35 ft (11 m)
Draft10 ft (3 m)
Propulsion
  • 4 × aluminum block Waukesha diesels, 2,400 bhp (1,800 kW)
  • 2 × shafts
  • 2 × controllable pitch propellers
Speed14 knots (26 km/h; 16 mph)
Complement7 officers, 70 enlisted
Sensors and
processing systems
AN/SQQ-14 mine hunting sonar
Armament
  • 1 × twin 20 mm gun
  • 2 × .50 cal (12.7 mm) twin machine guns
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