Academy sergeant major explained

The academy sergeant major^[1] is the senior non-commissioned officer instructor at a military academy.

British Army

At the British Army's Royal Military Academy Sandhurst, the academy sergeant major (AcSM)^[2] holds the rank of warrant officer class 1. Almost always held by a guardsman, it is one of the most senior warrant officer appointments in the British Army.

List of academy sergeant majors

Australian Defence Force

At the Australian Defence Force Academy, the academy sergeant major (ASM) also holds the rank of warrant officer class 1 or equivalent and is drawn on rotation from all three services.

Sri Lanka Army

At the Sri Lanka Military Academy, the academy sergeant major (ASM) is of the rank of warrant officer class I.

Notes and References

1. Note that in the British Army, the plural is "academy sergeant majors" and not "academy sergeants major". The earliest usage of "sergeant majors" in The Times is in 1822. The last of the (very occasional) usages of "sergeants major", except when referring to American NCOs, is in 1938.
2. ASM in the British Army stands for artificer sergeant major, an appointment in the Royal Electrical and Mechanical Engineers.