Mont. Code Ann. § 61-5-126

At the request of the director of the selective service system, provided for in 50 App. U.S.C. 460, the department shall provide a list of persons born in specified years who are holders of driver's licenses for the exclusive purpose of ensuring compliance with the military draft registration requirements of the federal Military Selective Service Act (50 App. U.S.C. 451, et seq.). The department shall notify the persons that information regarding them was released to the selective service system. The department may not provide the selective service system with the social security or driver's license numbers of persons on the list for any purpose.