In the United States Army, although there are several ranks of sergeant, the lowest carries the title of sergeant. Sergeant is the enlisted rank in the U.S. Army above specialist and corporal and below staff sergeant, and is the second-lowest grade of non-commissioned officer. The rank was often nicknamed "buck sergeant" to distinguish it from other senior grades of sergeants. Sergeants in the infantry, for example, lead fire teams of four men. There are two fire teams in a 9-man rifle squad, which is led by a staff sergeant. Sergeants are normally section and team leaders and are a critical link in the NCO channel. These non-commissioned officers live and work with their soldiers every day and are responsible for their health, welfare and safety. These section and team leaders ensure that their soldiers meet standards in personal appearance and teach them to maintain and account for their individual and unit equipment and property. The NCO enforces standards and develops and trains soldiers daily in their military occupational specialty and unit mission.
U.S. Army sergeant's shoulder insignia