Yea that is what he meant in the old vhf system the emergency band was 153.950 which later became the frequency for central medic band and then they switched to 153.830S F-4 Fireground (Chief/Company officers)
153.935S F-5 Fireground (WLO, WSC, FMO, Rescue 1)
154.965S F-6 Fireground (Subway/underground )