Army of the United States
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The term Army of the United States or Armies of the United States is the legal name of the collective land forces of the United States, as prescribed by the United States Constitution. In this concept, the term "Army of the United States" has been in use since at least 1841, as in the title General Regulations for the Army of the United States.
The Army of the United States, as an entity in and of itself, is also considered one of the four service components of the United States Army (the others being the Regular Army, the United States Army Reserve and the National Guard of the United States), but it has been inactive since the suspension of the draft in 1973 and the U.S. armed forces' transition to a volunteer force. Personnel serving in the United States Army during a major national emergency or armed conflict (either voluntarily or involuntarily) were enlisted into the Army of the United States, without specifying service in a component.
World War I
The original concept of a non-Regular Army component, existing to augment the standing military, can trace its origins to the United States Volunteers. State volunteer forces were used extensively to augment the Regular Army throughout the 19th and early 20th century. During World War I and dictated by the provisions of the National Defense Act of 1916, states contributed men to the "Volunteer Army" (more commonly known as the National Army). During World War I, a standard practice developed for Regular Army officers to serve in higher positions within the National Army, and thus hold two ranks - a permanent rank and a temporary rank. This concept was related to the idea of the brevet rank, which had generally fallen into disuse by the time of the First World War. The National Army was suspended after World War I.
World War II
In September 1940, the United States reintroduced conscription in response to the increasing likelihood of entry into World War II. Personnel voluntarily enlisting into the United States Army prior to spring 1940 could choose to voluntarily enlist into the Regular Army, National Guard of the United States, or Organized Reserve; after 14 May 1940, legislation provided that all voluntary enlistments in the United States Army during a time of national emergency or war were to be in the Army of the United States "without specification of any particular component or unit thereof." The "Army of the United States" as a service component was formally activated in February 1941. It was legally considered the successor to the National Army.
The Army of the United States saw a major expansion following the 7 December 1941 attack on Pearl Harbor. On 13 December 1941, legislation provided that personnel inducted into the United States Army under the terms of the Selective Training and Service Act of 1940 were, both retroactively and from that date on, considered to be serving in the Army of the United States.
The first commissioned officers serving in the Army of the United States were appointed from the Regular Army. The standard practice that these officers held a "permanent rank" within the Regular Army as well as a higher "temporary rank" while serving in the Army of the United States. A typical situation might be a colonel in the AUS holding the permanent rank of captain in the Regular Army. Another term for rank held in the Army of the United States was "theater rank."
Promotions within the Army of the United States were sometimes very rapid, and some officers were promoted as many as four to five times in the space of just three to four years. Dwight D. Eisenhower, who served as General of the Army, rose from a colonel to five-star general in three years. However, rank in the AUS could be revoked just as easily, with senior commanders who were relieved reverting to their permanent Regular Army rank. This was known as "loss of theater rank", with some instances of generals returning to the United States in disgrace or at least under a cloud, as only colonels or majors.
In 1946, with postwar demobilization, the Army of the United States was suspended, along with the draft. Officers from that point reverted to Regular Army rank and all enlisted personnel either were discharged from the Army of the United States and returned to civilian life, or chose to reenlist in the Regular Army. The Army of the United States was reinstated during the Korean War, but it was mainly confined to the enlisted force. Most commissioned officers in the Korean War held Regular Army rank only.
Korean War and Vietnam War
The Army of the United States was demobilized in 1946, but still maintained as a component of the Army. Upon the outbreak of the Korean War, the Army of the United States consisted of conscripts in the Regular Army, with the National Guard and Army of the United States existing simultaneously in the same theater. The system of Service Numbers was as follows:Template:Fact
- ER: Enlisted Reserve
- OR: Officer Reserve
- NG: National Guard
- RA: Regular Army
- US: Army of the United States
For the Korean War, the Army of the United States changed its abbreviation to "US", replacing the older "AUS". The last use of the Army of the United States was during the Vietnam War. It was disbanded in 1974, one year after US forces withdrew from the Republic of Vietnam.Template:Fact
The Army Reserve (USAR) and Army National Guard (ARNG) remained separate components during the modern era of conscription, and their members continued to use their unique identifiers, except in those cases in which officers were appointed or commissioned into a higher grade of rank while on active duty serving in a Regular Army unit. For example, during the war in Vietnam, a graduate of Army ROTC, commissioned as a USAR 2d lieutenant and serving his initial active duty tour, could be promoted to 1st lieutenant, or even captain, with a "temporary", active duty (i.e., AUS) commission, while still holding the permanent, USAR rank of 2d lieutenant. Another example would be an ARNG officer serving on active duty, who might accept a commission in the Regular Army (RA), and then might be promoted one or two grades in the AUS above their RA grade. This possibility could result in situations in which an Army National Guard captain could be called to active duty and accept a commission as a Regular Army major, then be promoted in the AUS, holding a "temporary", active duty commission at a higher rank, and then could retire after 20 or more years of active duty as a lieutenant colonel or colonel, while actually only having met the time-in-grade requirements (and passed the promotion board selection screening process) for the "permanent", Regular Army rank of major.Template:Fact
There is no equivalent to the Army of the United States in either the Navy, Marine Corps, or Coast Guard. In 1948, for a very brief period, a component known as the "Air Force of the United States" (AFUS) existed to augment Army Air Forces personnel, who held AUS ranks, into the newly created United States Air Force.
- U.S. Constitution, Article 2, Section 2, Clause 1
- United States Code, Title 10, Subtitle B, Chapter 301, Section 3001, Template:Usc
- United States Code, Title 32, Subtitle A, Chapter V, Subchapter F, Part 571 Subpart A, Section 571.1(c/3)
- Bailey, Beth, "America's Army: Making the All-Volunteer Force", Belknap Press; (November 23, 2009)
- * "The Draft Force of the United States Army", (Yarborough, William P., Lieutenant General, RA), Self Published, 1973
- "Conscription Order #1", Office of the War Department, Records of the Personnel Division (G-1), U.S. National Archives Record Group 165 
- Bell, William G., "Commanding Generals and Chiefs of Staff", Center of Military History, United States Army, 1997
- Haskew, Michael E., "West Point 1915: Eisenhower, Bradley, and the Class the Stars Fell On. Minneapolis", Quarto Publishing Group (2014)
- * United States National Archives, Military Personnel Records Center, "Army Force Components Training Guide" (Sep 2003)
- United States National Archives, Archival service record of Curtis Lemay (Summary of Service), released Nov 2008