What is "muster-master"

Muster-master, in Persian Lashkar-nevis (لشكرنويس) lit. "army scribe", was in Iran during the reign of the Qajar dynasty (1785–1925) the muster-master of the royal and imperial troops and a military office. Reza Shah Pahlavi abolished this post when he overtook power and reorganisated the military and governmental system.