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Military Units: Army - U.S. Department of Defense
U.S. Army Units Explained: From Squads to Brigades to Corps
Battalion (United States Army) - Wikipedia
Structure of the United States Army - Wikipedia
Battalion - Wikipedia
Battalion | Military Unit Structure & Organization | Britannica
Army Unit Structure: Divisions, Brigades, and Battalions
The U.S. Army's Command Structure
Military unit | Definition, Facts, & Examples | Britannica
Modern Military Force Structures | Council on Foreign Relations