Collection: Principal Operator John M. Ahern Assistant Fire Alarm Operator John M. Ahern, appointed July 3, 1914. General Order #32 of 1924, announcing the promotion of John M. Ahern to Fire Alarm Operator. Fire Alarm Operator John M. Ahern in Lieutenant’s-rank dress uniform, circa 1928. Fire Alarm Operator John M. Ahern on left, with an unknown Asst. Operator and Principal Operator to the right, circa 1930. General Order #26 of 1947 announcing the retirement of Principal Operator John M. Ahern.