Aggressive-class minesweeper

	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 &; 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.

Class overview
USS Constant (MSO-427) in 1988
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 & processing systems	AN/SQQ-14 mine hunting sonar
Armament	1 × twin 20 mm gun 2 × .50 cal (12.7 mm) twin machine guns