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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.
Up until 2017, Second Army was a direct reporting unit to the Army CIO/G-6, with the CIO reporting to the Secretary of the Army, while the G-6 reports to the Army Chief of Staff. A 2017 reorganization eliminated the need for Second Army's network operations coordinating function, and the headquarters was inactivated on 31 March 2017. [ 10 ]
The use of formalized ranks in a hierarchical structure came into widespread use with the Roman Army. [citation needed]In modern times, executive control, management and administration of military organization is typically undertaken by governments through a government department within the structure of public administration, often known as a ministry of defence or department of defense.
In keeping with the army's long-standing practice of referring to company-sized artillery units as "batteries" and company-sized cavalry units as "troops," the headquarters company element of an artillery battalion or higher is referred to as a headquarters and headquarters battery, or HHB, and the headquarters company element of a cavalry ...
The Pentagon, headquarters of the United States Department of Defense. The United States Department of Defense (DoD) has a complex organizational structure.It includes the Army, Navy, the Marine Corps, Air Force, Space Force, the Unified combatant commands, U.S. elements of multinational commands (such as NATO and NORAD), as well as non-combat agencies such as the Defense Intelligence Agency ...
First United States Army—U.S. Army Training, Readiness, and Mobilization command formation; Second United States Army—United States Army Cyber Command; Third United States Army—United States Army Central command formation; Fourth United States Army; Fifth United States Army—United States Army North command formation
These eras represent the major evolutions of army division structure (there have been several minor changes during these times). The 1911–1917 era lists divisions raised during the Army's first attempts at modernizing the division, prior to the authorization of permanent divisions, and the 1917–1941 era lists the first permanent divisions ...
Forces of the United States (the "Union" or "the North") formed the Union Army, consisting of a small body of regular army units and a large body of volunteer units raised from every state, north and south, except South Carolina. [34] For the first two years, Confederate forces did well in set battles but lost control of the border states. [35]