A major in the U.S. Army typically serves as a battalion executive officer (XO) or as the battalion operations officer (S3). A major can also serve as a primary staff officer for a regiment, brigade or task force in the areas concerning personnel, logistics and operations. A major will also be a staff officer / action officer on higher staffs and headquarters. In addition, majors command augmented companies in Combat Service and Service Support units. U.S. Army majors also command Special operations companies, such as U.S. Army Special Forces companies, Civil Affairs companies, Military Information Support Operations companies, as well as certain types of separate, numbered vice lettered, Military Intelligence companies.
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Sergeant Major is a senior non commissioned rank or appointment in many militaries around the world. In Commonwealth countries, Sergeants Major are usually appointments held by senior non-commissioned officers or warrant officers. In the United States, there are various degrees of Sergeant Major (Command Sergeant Major (CSM), Sergeant Major of the Army (SMA)), but they are all of the same paygrade.
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