The Director of Transportation shall from time to time certify to the Police Commissioner of Baltimore City the names of employees of that department for appointment by the Police Commissioner as Special Parking Enforcement Officers. Any appointment may be revoked by the Commissioner at any time. City Code, 1976/83, art. 19, §151B(1)(1st sen.), (4)(2nd cl.) Ord. 79-1159 Ord. 83-863 Ord. 15-435