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A sergeant major is a senior non-commissioned officer or warrant officer, depending on the country and military service in question.
Sergeant Major insignia
(U.S. Army)
In the U.S. Army, Sergeant Major refers to both a military rank and to a specific administrative position. The rank refers to the highest enlisted rank, just above Master Sergeant, with a
Command
Sergeant Major insignia
(U.S. Army)
The administrative position, Command Sergeant Major, is the senior enlisted advisor to the commanding officer and carries with it certain ceremonial functions such as caring for the units colors. Additionaly, they serve as monitors for and advocates of the enlisted men in the command.
An alternate usage of Command Sergeant Major is the senior NCO of a headquarters unit at battalion level or above; the soldier filling this position should carry the rank of Sergeant Major, but personnel shortages may, from time to time, force this sergeant major position to be held by a senior Master Sergeant.
Sergeant Major of the
Army insignia
(U.S. Army)
There exists one post, Sergeant Major of the Army, which is unique. The holder of this post represents the most senior enlisted member in the U.S. Army. The current incumbent, since January 2004, is SMA Kenneth O. Preston.
In the U.S. Marine Corps, Sergeant Major refers to a specific administrative position for a Master Gunnery Sergeant.
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U.S. military enlisted ranks | |||||||||
| E-1 | E-2 | E-3 | E-4 | E-5 | E-6 | E-7 | E-8 | E-9 | |
|---|---|---|---|---|---|---|---|---|---|
| Air Force: | AB | Amn | A1C | SRA | SSgt | TSgt | MSgt | SMSgt | CMSgt - |
| Army: | PV1 | PV2 | PFC | SPC - | SGT | SSG | SFC | MSG - | SGM - |
| Marine Corps: | Pvt | PFC | LCpl | Cpl | Sgt | SSgt | GySgt | MSgt - | MGySgt -
SgtMaj - SMOMC |
| Navy: | SR | SA | SN | PO3 | PO2 | PO1 | CPO | SCPO | MCPO - |
Sergeant Major is not now a rank in the British Army and Royal Marines. Until the late 19th century, the Sergeant Major (who wore four chevrons, later under a crown) was the senior NCO of a battalion or regiment. In the late 19th century this was redesignated Regimental Sergeant Major (RSM) and this in its turn became an appointment of the new rank of Warrant Officer Class 1 in 1915. RSM is still an appointment of WO1. The term 'sergeant major' is also used in various other warrant officer appointments.