YMS-1-class minesweeper

	USS YMS-324 in San Francisco Bay, c. 1945–46
Class overview
Name	YMS-1
Builders	35 yacht builders
Operators	United States Navy; Royal Navy; French Navy; Maritime Command; Polish Navy; Japan Maritime Self-Defense Force; Republic of Vietnam Navy;
Succeeded by	Atada class (Japan)
Subclasses	YMS-136, YMS-446
In commission	about March 1942 – 13 December 1957
Completed	481
Cancelled	YMS-482 – YMS-500
Active	0
Lost	32
General characteristics
Type	Minesweeper
Displacement	270 tons
Length	136 ft (41 m)
Beam	24 ft 6 in (7.47 m)
Draft	8 ft (2.4 m)
Propulsion	2 × 440 bhp (330 kW) General Motors 8-268A diesel engines; 2 shafts;
Speed	15 knots (28 km/h)
Complement	32
Armament	1 × 3-inch/50 caliber gun mount; 2 × 20 mm guns; 2 × depth charge projectors;

The YMS-1 class of auxiliary motor minesweepers was established with the laying down of YMS-1 on 4 March 1941. Some were later transferred to the United Kingdom as part of the World War II Lend-Lease pact between the two nations. One ship eventually made its way into the Royal Canadian Navy postwar.

Class overview
USS YMS-324 in San Francisco Bay, c. 1945–46
Name	YMS-1
Builders	35 yacht builders
Operators	United States Navy Royal Navy French Navy Maritime Command Polish Navy Japan Maritime Self-Defense Force Republic of Vietnam Navy
Succeeded by	Atada class (Japan)
Subclasses	YMS-136, YMS-446
In commission	about March 1942 – 13 December 1957
Completed	481
Cancelled	YMS-482 – YMS-500
Active	0
Lost	32
General characteristics
Type	Minesweeper
Displacement	270 tons
Length	136 ft (41 m)
Beam	24 ft 6 in (7.47 m)
Draft	8 ft (2.4 m)
Propulsion	2 × 440 bhp (330 kW) General Motors 8-268A diesel engines 2 shafts
Speed	15 knots (28 km/h)
Complement	32
Armament	1 × 3-inch/50 caliber gun mount 2 × 20 mm guns 2 × depth charge projectors