The United States Army (USA) is the largest branch of the
United States Armed Forces and performs
land-based military operations. It is one of the seven
uniformed services of the United States and is designated as the
Army of the United States in the United States Constitution, Article 2, Section 2, Clause 1 and United States Code, Title 10, Subtitle B, Chapter 301, Section 3001. As the oldest and most senior branch of the U.S. military in order of precedence,
 the modern U.S. Army has its roots in the
Continental Army, which was formed (14 June 1775) to fight the
American Revolutionary War (1775–1783)—before the United States of America was established as a country.
 After the Revolutionary War, the
Congress of the Confederation created the United States Army on 3 June 1784 to replace the disbanded Continental Army.
 The United States Army considers itself descended from the Continental Army, and dates its institutional inception from the origin of that armed force in 1775.
As a uniformed
military service, the U.S. Army is part of the
Department of the Army, which is one of the three military departments of the
Department of Defense. The U.S. Army is headed by a civilian senior appointed civil servant, the
Secretary of the Army (SECARMY) and by a chief
military officer, the
Chief of Staff of the Army (CSA) who is also a member of the
Joint Chiefs of Staff. In the
fiscal year 2017, the projected end strength for the
Regular Army (USA) was 476,000
Army National Guard (ARNG) had 343,000 soldiers and the
United States Army Reserve (USAR) had 199,000 soldiers; the combined-component strength of the U.S. Army was 1,018,000 soldiers.
 As a branch of the armed forces, the mission of the U.S. Army is "to fight and win our Nation's wars, by providing prompt, sustained, land dominance, across the full range of military operations and the spectrum of conflict, in support of combatant commanders".
 The branch participates in conflicts worldwide and is the major ground-based offensive and defensive force of the