Wiktionary
n. (context UK Australia army English) The senior warrant officer in an regiment or battalion, usually a warrant officer class 1.
Wikipedia
Regimental sergeant major (RSM) is an appointment held by warrant officers class 1 (WO1) in the British Army, the British Royal Marines and in the armies of many Commonwealth and former Commonwealth nations, including Ireland, Australia and New Zealand; and by chief warrant officers (CWO) in the Canadian Forces. Only one WO1/CWO holds the appointment of RSM in a regiment or battalion, making him the senior warrant officer; in a unit with more than one WO1, the RSM is considered to be " first amongst equals". The RSM is primarily responsible for maintaining standards and discipline and acts as a parental figure to his or her subordinates and also to junior officers, even though they technically outrank the RSM.
Usage examples of "regimental sergeant major".
The regimental sergeant major sloshed past me dressed only in a pair of green undershorts and carrying a Thompson submachine gun in one hand.
Evans, regimental sergeant major, volunteered to take them in Cook's jeep.
In a few weeks, perhaps less, some of you will go to our First Battalion with myself and with Regimental Sergeant Major Harper.
On the first night that Smith set the picquets, Regimental Sergeant Major Harper, hidden in a thicket of blackberries, put a bullet into a tree trunk beside the Captain.
One of the two men screamed in a tremulous, nerve-scraping voice until Regimental Sergeant Major Mclnerney shouted for the wounded man to be quiet, then ordered that the dead men be thrown forward to where the corpses were being stacked into a crude barricade.
Mendez is slated to become your regimental sergeant major after he completes the new Sergeant Majors Academy.
Probably only the regimental sergeant major and one or two of the troop-sergeants were my equals on horseback, and his lordship congratulated me once or twice on my riding.
Mostly NCOs, including the regimental sergeant major from the Special Operations Training Center at Bragg, Dick Voss.
On her right, facing the Australian, was a man with an accent from the north of Fngland and a voice that would have delighted his old regimental sergeant major.