Aggressive-class minesweeper

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USS Constant (MSO-427) in 1988
Class overview
Name	Aggressive class
Operators	United States Navy  Republic of China Navy  Belgian Navy  Royal Norwegian Navy  Royal Netherlands Navy  Philippine Navy
Subclasses	Onversaagd class
In commission	1953–Present
Completed	53
Active	1
Retired	52
Preserved	2
General characteristics
Type	Minesweeper
Displacement	853 tons (full load)
Length	172 ft (52 m)
Beam	35 ft (11 m)
Draft	10 ft (3 m)
Propulsion	4 × aluminum block Waukesha diesels, 2,400 bhp (1,800 kW) 2 × shafts 2 × controllable pitch propellers
Speed	14 knots (26 km/h; 16 mph)
Complement	7 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

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.