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The insignia of a WO1 is fairly recognisable and consists of the royal coat of arms worn on the lower sleeve. Royal coat of arms, sometimes surrounded by a wreath (depending on appointment).
This is the senior non-commissioned rank, with specialist roles in the technical and non-combatant services; in the combat and combat-support arms, responsible for discipline within the unit; and in war for its ammunition resupply and prisoner handling.
Appointments include conductor and regimental sergeant major.
In the British Army, warrant officers are usually referred to by their appointment rather than their rank. For example, the regimental sergeant major (RSM) is always a WO1, and is addressed as "Sir" or "Ma'am" by their subordinates.
