Fairfax County Fire, Police and EMS services combined. Fire and EMS - 4-Alpha (Dispatch), 4-Bravo (Response), 4-Charlie (Interstate Response), 4-Delta thru 4-Kilo (Priority for major incidents), plus Fairfax City. Police - All district dispatches (FO-Fair Oaks, FR-Franconia, MS-Mason, MC-McLean, MV-Mount Vernon, RE-Reston, SU-Sully, WS-West Springfield), plus Herndon, Vienna, and Fairfax City.