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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.
This list of United States Army divisions is divided into three eras: 1911–1917, 1917–1941, and 1941–present. 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 ...
The United States Army is made up of three components: one active—the Regular Army; and two reserve components—the Army National Guard and the Army Reserve. Both reserve components are primarily composed of part-time soldiers who train once a month, known as Battle Assembly , Unit Training Assemblies (UTAs), or simply "drills", while ...
Field armies. First Allied Airborne Army. 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.
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution. [15] The Army is the oldest branch of the U.S. military and the most senior in order of precedence. [16]
The United States Space Force (USSF) is the United States Armed Forces' space force and is the newest military branch. Originally established in 2019, it traces its history through Air Force Space Command and the Western Development Division to 1954. The United States Space Force is the principal space service, responsible for space warfare ...
Division insignia of the United States Army. Shoulder sleeve insignia (SSI) are cloth emblems worn on the shoulders of US Army uniforms to identify the primary headquarters to which a soldier is assigned. The SSI of some army divisions have become known in popular culture. [1][2][3]
The 1st Infantry Division (1ID) is a combined arms division of the United States Army, and is the oldest continuously serving division in the Regular Army. [ 5 ] It has seen continuous service since its organization in 1917 during World War I. [ 6 ] It was officially nicknamed "The Big Red One" (abbreviated "BRO" [ 2 ]) after its shoulder patch ...