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A battalion, usually about 400-strong, is comprised of three rifle companies, a combat support company, and a headquarters company. Cavalry units refer to this unit level as a troop. In the artillery corps, a company would be called a battery. Companies are the basic elements of all battalions. They consist of four platoons, usually of the same type, a headquarters unit, and some logistical capabilities. Company-sized units, 130 to 150 soldiers, are normally commanded by captains. Lieutenants lead most platoons, and the second-in-command is generally a sergeant first class.
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A platoon is four squads: generally three rifle squads and one weapons squad, normally armed with machine guns and anti-tank weapons. A small military unit consisting of ten to eleven soldiers, normally led by a staff sergeant.
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