1953年5月美军成功测试大炮发射战术原子弹，共造了20尊这样的大炮用于韩战，但因中方接受了美军停火条件而未派上用场

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The Atomic Cannon, at 280 mm, was the largest nuclear capable mobile artillery piece manufactured by the United States. On May 25, 1953, a 280 mm cannon fired an atomic projectile a distance of 7 miles at the Nevada Test Site. Twenty 280 mm cannons were manufactured. None were used in battle.