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This is a list of current formations of the United States Army, which is constantly changing as the Army changes its structure over time. Due to the nature of those changes, specifically the restructuring of brigades into autonomous modular brigades, debate has arisen as to whether brigades are units or formations; for the purposes of this list, brigades are currently excluded.
The United States Army Regimental System (USARS) is an organizational and classification system used by the United States Army.It was established in 1981 to replace the Combat Arms Regimental System (CARS) to provide each soldier with continuous identification with a single regiment, and to increase a soldier's probability of serving recurring assignments with their regiment.
Corps: Formerly consisted of a corps headquarters and two or more divisions, corps troops (consisting of corps artillery, an armored cavalry regiment, an air defense artillery group, and an army aviation group), an expeditionary sustainment command (ESC) and other organic support brigades. A corps is now designated as an "operational unit of ...
Following the advent of the armored division, infantry divisions became officially designated by "Infantry Division" (with the 25th Infantry Division being the first constituted by the adjutant general as such). All of the 1917–1941 (non-cavalry) divisions, with the exceptions of the 10th through 20th and 101st Divisions, would be ...
10th Infantry Division. June 1948 - June 1958. 11th Infantry Division "Lafayette Div" (Regular Army/National Guard 1918–19; distinct from National Guard 11th Division)
1st Infantry Regiment (United States) 2nd Infantry Regiment (United States) 3rd U.S. Infantry Regiment (The Old Guard) 4th Infantry Regiment (United States) 5th Infantry Regiment (United States) 6th Infantry Regiment (United States) 7th Infantry Regiment (United States) 8th Infantry Regiment (United States) 9th Infantry Regiment (United States)
A square division typically operates with either: two infantry brigades in line, and one infantry regiment forward and one in reserve, or; on a narrower front, with the brigades echeloned (one ahead of the other), (In contrast, the triangular division normally employs a "two up, one back" arrangement for its three infantry regiments/brigades.)
0–9. 1st Infantry Division (United States) 2nd Infantry Division (United States) 3rd Infantry Division (United States) 4th Infantry Division (United States)