Army of the United States
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The Army of the United States or Armies of the United States is the legal name of the "land forces of the United States" (United States Constitution, Article 2, Section 2, Clause 1 and United States Code, Title 10, Subtitle B, Chapter 301, Section 3001) and has been used in this context since at least 1841, as in the title: General Regulations for the Army of the United States. The Army, or Armies of the United States includes: the Regular Army, Army National Guard, and the Army Reserve, (as well as any volunteer or conscripted forces). 
The Army of the United States (AUS) was also used as the official name for the conscription (U.S. term: draft) force of the United States Army that may be raised at the discretion of the United States Congress when the United States enters into a major armed conflict. The "Army of the United States," in this context, was used in World War II, the Korean War, and the Vietnam War.
World War II
On its reinstatement for the Korean War[clarification needed], 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:
- 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."
Vietnam and beyond
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, or USAR rank of 2d lieutenant. Another example would be an ARNG officer serving on active duty 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 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 Regular Army, or "permanent" rank of major.
- >"army-of-the-united-states." Dictionary.com Unabridged. Random House, Inc. 21 Jun. 2015. <Dictionary.com http://dictionary.reference.com/browse/army-of-the-united-states>.
- "The Draft Force of the United States Army", (Yarborough, William P., Lieutenant General, RA), Self Published, 1973
- Commanding Generals and Chiefs of Staff, (Bell, William G.), Center of Military History, United States Army, 1997
- The Sergeants Major of the Army, (Gillespie, Mark F., Hawkins, Glen R., Kelly, Michael B, Pierce, Preston E.), Center of Military History, United States Army, 1995
- "Case Reference Guide for Review of Military Records", Military Personnel Records Center, published 2001
- "Army Force Components Training Guide", Military Personnel Records Center, published 2003
- United States Army Service Records (1910–2005), National Personnel Records Center, Overland, Missouri
- Article Two of the United States Constitution