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The munition with knives has been around since at least the Vietnam War.The military term for the warhead is flechettes, which are dart-like submunitions that are released and spread out in flight as an anti-personnel device, munitions have had a variety of warheads since before the Civil War, where they used everything from classic exploding cannonballs, todumbbell-shaped projectiles and grapeshot, which was basically shotgun-shell BBs (only much larger) that used mass and velocity as the engagement mechanism.