Sergeant major instructor
Sergeant major instructor (SMI) is a British Army appointment held by warrant officers class 1 in the Small Arms School Corps and the Army Physical Training Corps and by some WO1s in the Royal Engineers.
Cadet forces
It is also a rank held by some of the civilian[1] adult instructors in the Army Cadet Force, ranking between staff sergeant instructor and regimental sergeant major instructor.[2] SMIs of the ACF do not hold a warrant and thus are not warrant officers, although their badges of rank are similar to those of an army warrant officer class 2.[3][4]
References
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