The Chief of Police is hereby empowered to appoint special school zone police officers, who shall have the duty of controlling and directing traffic upon designated parts of the streets, avenues, roads, alleys or ways at or near schools in the City. In the performance of their duties, the special school zone police officers shall be vested with all the powers of City police officers. Such special school zone police officers shall be in uniform, and shall display a badge or other sign of authority. The officers shall serve at the will and pleasure of the Chief of Police, and shall not come within the civil service provisions or pension applicable to members of the Police Department.