Garrison sergeant major
| Garrison sergeant major | |
|---|---|
Garrison Sergeant Major London District's badge of rank | |
| Country | United Kingdom |
| Service branch | British Army |
| Abbreviation | GSM |
| Rank group | Warrant officer |
| NATO rank code | OR-9 |
| Formation | 1940 |
A garrison sergeant major (GSM) in the British Army is the senior warrant officer of a garrison and holds the rank of warrant officer class 1. The GSM London District, always a guardsman, holds one of the four most senior WO1 appointments in the British Army, and has military ceremonial responsibility for important state occasions such as Trooping the Colour.