Quartermaster sergeant instructorQuartermaster sergeant instructor is a warrant officer appointment in the armies of the United Kingdom and Canada.British ArmyQuartermaster sergeant instructor is an appointment held by warrant officers class 2 in the British Army's Small Arms School Corps and by some in the Royal Engineers and Royal Army Physical Training Corps.CanadaIn the Canadian Army, QMSI is an appointment held by the senior master warrant officer, within each battalion of the Princess Patricia's Canadian Light Infantry.