A tank is a fast-moving, well-protected, heavily armed behemoth designed to dominate the land battlefield. As the primary offensive weapon in any army, nations compete to field the best tanks in both peace and war. In the 1980s, the U.S. Army took the drastic step of arming its tank, the M1 Abrams, with the ultimate upgrade: a tank-killing round made of uranium, the heaviest naturally occurring element on Earth. The result is an unmatched tank killer capable of destroying any fielded tank.
The M1 Abrams tank was first fielded by the U.S. Army in the 1980s. The Army had preferred the 105-millimeter gun, the British-designed Royal Ordnance L7, also known in the United States as the M68.
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