I was just asking that question last week. The communications needs of managing a mass casualty incident in a large urban area are complex and require a lot of coordination beyond the rear of a supervisor vehicle or a command table. Tracking all inbound ambulances, staging resources, polling hospitals to ascertain how many reds, yellow and green they can each take, tracking which units are transporting to which hospitals. Communicating with command staff, medical director, hospitals via landlines, coordination of EMS specialty units etc. I think NYC EMS could certainly use a staffed and dedicated field comm. JMO