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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.
Since the adoption of the total force policy, in the aftermath of the Vietnam War, reserve component soldiers have taken a more active role in U.S. military operations. Reserve and Guard units took part in the Gulf War, peacekeeping in Kosovo, and the 2003 invasion of Iraq. Although the present-day Army exists as an all-volunteer force ...
The chief of staff of the Army, who is the highest-ranked military officer in the army, serves as the principal military adviser and executive agent for the secretary of the Army, i.e., its service chief; and as a member of the Joint Chiefs of Staff, a body composed of the service chiefs from each of the four military services belonging to the ...
A typical unit is a homogeneous military organization (either combat, combat-support or non-combat in capability) that includes service personnel predominantly from a single arm of service, or a branch of service, and its administrative and command functions are self-contained. Any unit subordinate to another unit is considered its sub-unit or ...
Organic Units Commanding General 1st Infantry Brigade: 1st Division: May 24, 1917 16th Infantry Regiment 18th Infantry Regiment 2nd Machine Gun Battalion Brig. Gen. Omar Bundy Brig Gen. George B. Duncan Brig. Gen. John L. Hines Brig. Gen. Frank Parker Col. Hjalmar Erickson 2nd Infantry Brigade: 1st Division: May 24, 1917 26th Infantry Regiment
Units still in existence are in bold. For specific eras: Formations of the United States Army during the Mexican Revolution; Formations of the United States Army during World War I; Formations of the United States Army during World War II; Formations of the United States Army during the Vietnam War
This relatively low number (compared to the high estimates) was partially due to the army's policy of assigning many combat units, particularly artillery and tank destroyer units, directly to corps and higher-level commands. These non-divisional units numbered approximately 1.5 million soldiers, enough personnel to man roughly 100 more divisions.
The origin of the nickname is noted where possible. In some cases, the nickname was officially adopted by the division in question; this is indicated along with date of adoption (where known). Official status might also be inferred by the presence of the nickname on official distinctive unit insignia or in official military source materials.