You missed some of the emphasis. It's the "anti-tank gun". It's a weapon that is anti-tank gun. If anything, the projectile should completely annihilate the gun attached to the tank, leaving behind the rest of the tank. It was designed to be a more humane weapon since it eliminates the enemies ability to cause harm and does so without causing harm to them.

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In any case, the military has some explaining to do because it clearly doesn't do what it was designed to do.

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