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Corps area
A Corps area was a geographically-based organizational structure (area command) of the United States Army used to accomplish administrative, training and tactical tasks from 1920 to 1942. Each corps area included divisions of the Regular Army, Organized Reserve and National Guard of the United States. Developed as a result of serious mobilization problems during World War I, this organizational scheme provided a framework to rapidly expand the Army in time of war or national emergency such as the Great Depression.
The nine corps areas, created by the War Plans Division under authority of War Department General Order No. 50 on 20 August 1920, had identical responsibilities for providing peacetime administrative and logistical support to the army’s mobile units as was provided by the six territorial "Departments" they replaced. In addition, the corps areas took on the responsibilities for post and installation support units ("Zone of the Interior" units) created during World War I. Corps areas had the added responsibility for planning and implementing mobilization plans for all Regular Army, National Guard, and Organized Reserve mobile units in their respective geographic areas; the development and administration of hundreds of new Organized Reserve and Reserve Officers Training Corps (ROTC) units; and managing the personnel records for thousands of Reserve officers, enlisted personnel, ROTC cadets, and Citizens Military Training Camp (CMTC) candidates.
The composition of the corps areas divided the United States geographically by state lines and population density into nine multi-state area commands roughly equal in population. Each corps area was responsible for organizing two tactical corps consisting of three infantry divisions each. Each corps area also had responsibility for organizing various other field army, General Headquarters Reserve, Zone of the Interior (later designated as Corps Area Service Command), and Communications Zone units. The First, Second, Third, Fourth, Eighth, and Ninth Corps Areas also organized units to man various fixed coastal defenses. The corps areas were further grouped into three army areas of two field armies each.
== Early army administrative units ==
For the century preceding 1920 the U.S. Army was geographically divided into series of Military Divisions, "Departments" and smaller "Districts" and Subdistricts. Departments and divisions were numbered or named for their geographic location. Before the War of 1812 these administrative units were geographically named starting with the Department of the East and Department of the West. About 1815, the areas were numbered until after the Civil War. After the Civil War, the system used until after World War I was again geographically identified; i.e. Department of the East or Department of the Missouri and subordinate units were called divisions or districts. The last reorganization of departments was done in 1917 after the beginning of World War I.
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