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t. e. The United States Army ( USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution. [ 15 ] The Army is the oldest branch of the U.S. military and the most senior in order of precedence. [ 16 ]
An army, [1] ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by possessing an army aviation component. Within a national military force, the word army may also mean ...
The history of the United States Army began in 1775, as part of the United States Armed Forces. The Army's main responsibility has been in fighting land battles and military occupation. The Corps of Engineers also has a major role in controlling rivers inside the United States. The Continental Army was founded in response to a need for ...
The United States Armed Forces are the military forces of the United States. [ 13] The armed forces consist of six service branches: the Army, Marine Corps, Navy, Air Force, Space Force, and Coast Guard. [ 14][ 15] All six armed services are among the eight uniformed services of the United States, along with the U.S. Public Health Service ...
In contemporary use, the term Regular Army refers to the full-time active component of the United States Army, as distinguished from the Army Reserve and the Army National Guard. A fourth component, the Army of the United States, has been inactive since the suspension of the draft in 1973 and the U.S. armed forces became an all-volunteer armed ...
Team: The smallest unit. A fire team consists of a team leader (usually a sergeant or corporal ), a rifleman, a grenadier, and an automatic rifleman. A sniper team consists of a sniper who engages the enemy and a spotter who assists in targeting, team defense, and security. 4 soldiers.
First United States Army – U.S. Army Training, Readiness, and Mobilization Command formation at Rock Island Arsenal, Illinois. Third United States Army – United States Army Central command formation headquartered at Shaw AFB. Fifth United States Army – United States Army North command formation at Joint Base San Antonio, Texas.
APPN – Appropriation Number (U.S. Military) APRT – Army Physical Readiness Test (U.S. Army) ARCENT/TUSA – US Army Central /HQ Third US Army (TUSA) [ 3] ARPANET – Advanced Research Projects Agency Network (e.g., 1969 to 1989; antecedent of the information superhighway; now DARPA) ARM – Anti-Radar Missile.