In any ordinance creating a civil service system, the governing body shall designate the departments, classes of employees, and the appointive officials of the city who shall come under the system, and it subsequently may add thereto. All full-time paid employees of the fire and police departments, with the chiefs thereof, shall be placed under any civil service system adopted whether they are designated in the ordinance or not.
N.D.C.C. § 40-44-08