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The M18 Claymore mine is a remotely-detonated anti-personnel mine used by the US military. The mine consists of 700 steel ball-bearings behind a C-4 charge. When detonated, the mine fires the ball bearings out in a forward-directed fan pattern 6.5 feet tall, 50 meters wide, with an effective range of 50 meters, though the bearings can travel as far as 250 meters. The weapon was designed in 1960 as a counter to human wave attacks such as those used by the Japanese in World War II and the Chinese and North Koreans in the Korean War, and went on to see use in the Vietnam War and subsequent conflicts.