The United States Army or US Army is the branch of the United States Armed Forces responsible for land-based military operations. It is the largest and oldest established branch of the U.S. military, and is one of seven U.S. uniformed services. The modern Army has its roots in the Continental Army which was formed on 14 June 1775, before the establishment of the United States, to meet the demands of the American Revolutionary War. The Congress of the Confederation officially created the United States Army on 3 June 1784 after the end of the revolutionary war to replace the disbanded Continental Army. The Army considers itself to be descended from the Continental Army and thus dates its inception from the origins of that force.

The primary mission of US Army is to "provide necessary forces and capabilities ... in support of the National Security and Defense Strategies." The Army is a military service within the Department of the Army, one of the three military departments of the Department of Defense. The Army is headed by the Secretary of the Army, and the highest ranking military officer in the department is the Chief of Staff of the Army. In fiscal year 2009, the Regular Army reported a strength of 549,015 soldiers; the Army National Guard (ARNG) reported 358,391 and the United States Army Reserve (USAR) reported 205,297 putting the combined component strength total at 1,112,703 soldiers.
United States Army
Active 14 June 1775 – present
Country United States
Allegiance United States of America
Type Army
Size 549,015 Active personnel
563,688 Reserve and National Guard personnel
Part of Department of War
Department of the Army
Motto "This We'll Defend"
Engagements Revolutionary War
Indian Wars
War of 1812
Mexican-American War
Utah War
American Civil War
Spanish-American War
Philippine-American War
Banana Wars
Boxer Rebellion
Border War
World War I
World War II
Korean War
Vietnam War
Gulf War
Somali Civil War
Kosovo War
War In Afghanistan
Iraq War
Chief of Staff GEN George W. Casey, Jr.
Vice Chief of Staff GEN Peter W. Chiarelli
Sergeant Major of the Army SMA Kenneth O. Preston
Recruiting Logo "Army Strong" US Army logo.svg