'Regimental Quartermaster Sergeant' is a
military rank in some militaries, and an appointment in others.
Irish Defence Forces

BQMS insignia (Irish Army)
'Battalion Quartermaster Sergeant' ('BQMS') (''Ceathrúsháirsint Cathláin'' in
Irish) is a rank in the
Irish Army and
Irish Air Corps equivalent to Warrant Officer Class 1 (NATO OR-9) in the British Army. The equivalent in the Artillery Corps is 'Regimental Quartermaster Sergeant' ('RQMS')
Singapore
Like the UK example, the Regimental Quartermaster Sergeant is an appointment in a battalion-sized unit usually held by a
Second Warrant Officer. He is the senior assistant to the
Quartermaster, who may be a more senior
Warrant Officer for non-combat units.
United Kingdom

Warrant Officer Class 2 (QMS) insignia (British Army)
'Regimental Quartermaster Sergeant' ('RQMS') is an appointment held by a senior
Warrant Officer Class 2 in the
British Army and
Royal Marines. The RQMS is the senior assistant to the
Quartermaster of a
regiment or
battalion and also usually functions as the deputy
Regimental Sergeant Major. Some units have more than one RQMS. RQMS was a separate rank until 1915, when it became a Warrant Officer appointment with the creation of Warrant Officers Class II.
In the
Household Cavalry, the appointment is instead 'Regimental Quartermaster Corporal' ('RQMC').