The M1 Abrams is a main battle tank prouced in the United States. The M1 is named after General Creighton Abrams, former Army Chief of Staff and commander of the 37th Armored Regiment. It is a well armed, heavily armored, and highly mobile tank designed for modern armored ground warfare. Notable features of the M1 Abrams include the use of a powerful gas turbine engine, the adoption of sophisticated composite armor, and separate ammunition storage in a blow-out compartment for crew safety. It is one of the heaviest tanks in service, weighing in at close to 70 tons.