There is hereby established in all counties adopting the provisions of this act a county law enforcement department, which shall be composed of a superintendent, assistant superintendent and such other officers and personnel as the agency shall by resolution provide. Such department shall be under the exclusive supervision and control of the superintendent and no member of the agency shall by individual action interfere with the operation of the department or the conduct of any of the officers or other personnel of such department. The superintendent shall be responsible to the agency for the operation and administration of the department and for the enforcement of law and providing of police protection within the county in conformance with rules and regulations adopted by such agency. The superintendent shall designate and appoint an assistant superintendent who shall serve in such capacity at the pleasure of the superintendent.