United States Army Overview and History

Army role in U.S. defense

The United States Army is the land service branch of the U.S. Armed Forces and the primary land-based component of the Department of Defense. Its constitutional and statutory role is to defend the United States and its territories, preserve peace and security, support national policies, implement national objectives, and defeat nations or forces responsible for aggression. The Army is led by a civilian Secretary of the Army and a military Chief of Staff, and consists of the Regular Army, Army National Guard, and Army Reserve. The Army provides prompt and sustained land combat through combined-arms operations, including infantry, armor, artillery, aviation, air defense, airborne, air assault, and special operations. It also supports joint and multinational forces by establishing and sustaining theaters of operation and integrating land power with national and allied capabilities. Its equipment includes combat vehicles such as the M1 Abrams and Bradley, helicopters such as the UH-60 Black Hawk, and missile-defense systems including Patriot, THAAD, and Ground-Based Midcourse Defense. Historically, the Army has defended U.S. interests in conflicts ranging from the Revolutionary War and Civil War to the World Wars, Korea, Vietnam, the Gulf War, Afghanistan, Iraq, and contemporary security operations.

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Army organization and leadership

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