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Prior to 1918, the Army was a single entity known as the United States Army. During the First World War, the National Army was founded which was the massive draft and call-up force needed to fight the conflict. In the 1920s and 1930s, the "career" soldiers were known as the Regular Army with the Enlisted Reserve Corps and Officer Reserve Corps augmented to fill vacancies when needed.
In 1941, the Army of the United States was founded to fight the Second World War. The Regular Army, Army of the United States, and Officer/Enlisted Reserve Corps (ORC and ERC) existed simultaneously giving rise to the first concept of Army components. After World War II, the ORC and ERC were combined into the United States Army Reserve. The Army of the United States continued throughout the Korean War and Vietnam War and was discontinued upon the abolishment of the draft.
In the modern age, the Army is divided into the Regular Army and the Army Reserve. The United States National GuardThe United States National Guard is a significant component of the United States armed forces military reserve. The National Guard draws from state guard forces, but should not be confused with the reserves of the various services which serve primarily as is an armed force under the command of state governments. Prior to the 21st century, members of the National Guard were considered state employees only unless federalized by the Army in which case National Guard members became members of the Army Reserve. In the modern age, all National Guard members hold dual status as Guardsman (under the authority of the State Adjutant General) and Army Reservists under the authority of the Army Human Resources Command.
By design, the use of the Army Reserve and National Guard has increased since the Vietnam War. Reserve and Guard units took part in the Gulf WarSee also: 2003 invasion of Iraq. The Persian Gulf War was a conflict between Iraq and a coalition force of 34 nations led by the United States. The war started with the Iraqi invasion of Kuwait in August 1990. The result of the war was a decisive victory, peacekeeping in KosovoKosovo and Metohija ( Serbian: Albanian: Kosova , usually called just Kosovo is an autonomous province of Serbia (which together with Montenegro constitutes Serbia and Montenegro). It is currently administered by the United Nations following the recent Ko, and the 2003 invasion of Iraq.
Officially, a member of the U.S. Army is called a ' SoldierCorporal, armed with an MP-5) A soldier is a person who has enlisted with, or was conscripted into, the armed forces of a sovereign country and has undergone training and received equipment to defend that country or its interests. Soldiers are a part of s,' with a capital letter.
The U.S. Army is structured:
The Army is organized by function. Combat forces include Infantry, Armor, Cavalry, Artillery, and Special Forces. Combat support troops include Army Aviation, Army Corps of Engineers, Quartermaster Corps , Medical Corps , Transportation Corps , Ordnance Corps , Adjutant General's Corps, Signal Corps, Intelligence Corps. Support troops include the Judge Advocate General's Corps.