Senior Master Sergeant / First Sergeant

Senior Master Sergeants in the First Sergeant special duty serve as First Sergeants of larger units than those employing a Master Sergeant as a First Sergeant. These First Sergeants (pay grades E-7 to E-9) are referred to officially as "First Sergeant" (regardless of their pay grade), and unofficially as "First Shirt" or simply the "Shirt".

Please see Senior Master Sergeant.