Editing Corps area (section)

===Third Army Area===
Third Army Area included Third Army (Active), including, seemingly, the Reserve [[23rd Cavalry Division (United States)]], and Sixth Army (reserve on paper).

*'''[[Seventh Corps Area]]''' initially included Kansas, Minnesota, Missouri (but not Jefferson Barracks), North Dakota, South Dakota, Iowa and Nebraska. Responsibility for Arkansas was transferred from the Fourth Corps Area to the Seventh Corps Area on 1 December 1920. The headquarters was established on 20 August 1920 with headquarters at [[Fort Crook, Nebraska]], again from elements of the previous Central Department. HQ, Seventh Corps Area moved to Fort Omaha, NE, on 27 May 1922 and further moved to the Army Building at 15th and Dodge Streets in Omaha - the Omaha Army Depot - on 25 March 1929.{{sfn|Clay|2010a|p=59}} 
*'''[[Eighth Corps Area]]''', variously headquartered in Dallas and [[Fort Sam Houston]] in [[San Antonio]], Texas, replaced the Southern Department and included Texas, Oklahoma, Colorado, New Mexico and Arizona. From 1922-27 the [[44th Observation Squadron]] was attached to the Field Artillery School, initially at Post Field, Oklahoma. The [[154th Observation Squadron]] was assigned to the Eighth Corps Area on 16 September 1940, but was later reassigned to Third Army.
*At the end of General [[Frank M. Andrews]]' four-year term as Commanding General of [[GHQ Air Force]] on March 1, 1939, he was not reappointed, reverted to his permanent rank of colonel, and was reassigned as air officer for the Eighth Corps Area in San Antonio, the same exile to which [[Billy Mitchell]] had been sent. Possibly expected to retire, he instead was recalled to Washington just four months later by Marshall after President [[Franklin D. Roosevelt]] named [[George C. Marshall]] to serve as [[Chief of Staff of the United States Army]] following [[Malin Craig]]'s retirement.
*'''Ninth Corps Area''', headquartered at the [[Presidio of San Francisco]], California, replaced the [[Western Department]] and included Alaska, Idaho, Montana, California, Wyoming, Washington, Utah, Nevada and Oregon.<ref name=Matchette>{{Citation
  |last = Matchette
  |first = Robert
  |title =Guide to Federal Records in the National Archives of the United States
  |publisher=National Archives and Records Administration
  |year=1995
  |location = Washington, D.C.
  |display-authors=etal}}</ref> Included the [[41st Infantry Division (United States)|41st Division]], the [[18th Squadron (Observation)]] from October 1921 to July 1922; the [[19th Pursuit Squadron|19th Squadron (Pursuit)]] October 1921-June 1922; and the [[7th Bombardment Group]] from 1 June 1928 - c. 30 October 1931, and then again from c. 1 October 1933 - 1 March 1935. [[17th Attack Group]] was located at [[March Field]] from 1931 but reported to the [[1st Bombardment Wing]].{{sfn|Maurer|1983|p=373}} The 91st Aero Squadron, later the [[91st Observation Squadron]], was almost continuously associated with the Ninth Corps Area from its reformation on 20 August 1920 until 1940. The 805th Observation Squadron was constituted in the Organized Reserve (Oregon) on 31 March 1924; and was then consolidated on 8 December 1936, with the 805th Aero Squadron. Its mission was to provide aerial observation support to the Commanding General, Ninth Corps Area. The 805th Observation Squadron was inactivated on 11 June 1937 and then disbanded on 31 May 1942.{{sfn|Clay|2010c}} 

The [[Civilian Conservation Corps]] was organized roughly along army corps area boundaries since most of the logistical administration and support (food, housing, uniforms, transportation) for this 1930s Great Depression-era emergency work program was provided by the U.S. Army. The corps areas provided [[Regular Army (United States)|Regular Army]] officers to oversee these tasks. In time, they were replaced by officers of the Organized Reserve, freeing Regular Army officers to return to their assigned duties and providing practical experience to the Reserve officers.<ref name=CCC>{{Citation|title= Civilian Conservation Corps Legacy|url =https://ccclegacy.org/ccc-camp-lists/}}</ref>