| The M1 Abrams is a military tank produced 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 main battle tank, the well armed, heavily armored, and highly mobile offensive mainstay of 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. The M1 Abrams entered U.S. service in 1980, replacing the M60 Patton and M48A5. It did, however, serve for over a decade alongside the improved M60A3, which had entered service in 1978. Three main versions of the M1 Abrams have been deployed, the M1, M1A1, and M1A2, incorporating improved armament, protection and electronics. These improvements, as well as periodic upgrades to older tanks have allowed this long-serving vehicle to remain in front-line service. It is the principal combat tank of the United States Army and the Marine Corps, and the armies of Egypt, Kuwait, Saudi Arabia, and as of 2007, Australia. | 
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