NDA §277. Where a riot or disturbance occurs or is considered as likely to occur, the attorney general of the province in which the place where the riot or disturbance occurs or is considered as likely to occur is situated, on the initiative of the attorney general or on the receipt of notification from a judge of a superior, county or district court having jurisdiction in the place that the services of the Canadian Forces are required in aid of the civil power, may, by requisition in writing addressed to the Chief of the Defence Staff, require the Canadian Forces, or such part thereof as the Chief of the Defence Staff or such officer as the Chief of the Defence Staff may designate considers necessary, to be called out on service in aid of the civil power.