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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