Editing Corps area (section)

===Second Army Area===
Second Army Area included Second Army (Active) and Fifth Army (reserve on paper).

*'''[[Fourth Corps Area]]''' replaced the [[Southeastern Department]] based in Charleston, South Carolina and was originally headquartered there then transferred to Atlanta, Georgia, and encompassed the states of Alabama (for a period), Florida, Georgia, Louisiana, Mississippi, North Carolina, South Carolina and Tennessee. Formations included Third Army (1936–40); IV Corps: [[4th Infantry Division (United States)|4th Division]], 30th Division, 31st Division; XIV Corps: 81st Division, 82d Division, 87th Division; Fourth Coast Artillery District; and [[Fourth Corps Area Service Command]].{{sfn|Clay|2010a|p=40}}
*'''[[Fifth Corps Area]]''' was established on 20 August 1920 with headquarters at [[Fort Benjamin Harrison]], Indiana, and organized from parts of the discontinued [[Central Department (United States Army)|Central Department]]. The headquarters was transferred to [[Fort Hayes]], [[Columbus, Ohio]], on 20 June 1922. The Fifth Corps Area included the states of Indiana, Ohio, West Virginia, and Kentucky. The headquarters was responsible for the units of the [[Second United States Army|Second]] and Fifth Armies, the V Army Corps (5th, 37th, and 38th Divisions) and XV Army Corps (83rd, 84th, [[100th Infantry Division (United States)|100th Infantry Division]]s), select GHQ Reserve units, and Zone of the Interior support units of the [[Fifth Corps Area Support Command]]. Mobile units of the corps area, less GHQ Reserve and Z.I. units, were assigned to the Second and Fifth Armies from 1921 to 1933. With the adoption of the four field army plan on 1 October 1933, the units of the Fifth Corps Area were reassigned to the Second Army, GHQR, or demobilized.{{sfn|Clay|2010a|p=48}}
*'''[[Sixth Corps Area]]''' covered the states of Wisconsin, Michigan and Illinois and [[Jefferson Barracks]], Missouri. The headquarters was established at [[Sheridan Reserve Center|Fort Sheridan]], Illinois, in August 1920, from portions of the former Central Department, but then moved to the [[U.S. Post Office]] Building at 1819 West Pershing Road in Chicago on 10 October 1921. Sixth Corps Area was responsible for the mobilization, administration, and training of units of the Second and Fifth Armies, I Cavalry Corps (Regular Army, but inactive, 1927–1940), VI Army Corps (including the Regular Army [[6th Infantry Division (United States)|6th Division]], [[32nd Infantry Division (United States)|32d]] and 33rd Divisions) and XVI Army Corps (85th, 86th, 101st Divisions), select GHQ Reserve units, and the Zone of the Interior support units of the [[Sixth Corps Area Support Command]].{{sfn|Clay|2010a|p=53}}