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A company is a military unit of the United States Army which has been in use since the American Revolutionary War. It has historically been commanded by a Captain, assisted by a First Sergeant as the senior-most non-commissioned officer (NCO), and consisted of approximately one hundred soldiers. Soldiers were divided between three and five platoons of around thirty each and led by a lieutenant. However the exact size and composition of a company has varied depending on the time period and its role.