Hey all. Up here in New Haven County, CT the numbering system for apparatus (fire and EMS) is up to the town or district. There are several numbering systems from station numbers first with the unit number second (or third in some cases) or continuous (Engine 1, Engine 2, rescue 3 Ladder 4 for example). Where I used to work, C-MED New Haven, all EMS comms on MED 10 used a specific numbering system to talk to us. The System has three parts. The first number designates the type of unit: 1 = First Responder unit or one MRT or EMT in an ambulance acting as a first responder only. 2 = Transporting ambulance with two EMT's or an EMT and MRT 3 = Heavy Rescue unit (both fire and rescue corps units, not used as much today) 4 = IV Tech rsponding on ambulance or First Responder 5 = Paramedic on ambulance or in Medic Fly Car 10 = Medical Doctor The Second part is a Phonic letter designation that tells what town or agency the unit is from. There is no specific way these were picked, here are some Examples Alpha = New Haven Fire Department Bravo = Ansonia Rescue Medical Service Charlie = AMR Delta = Hamden Fire Deparment Echo = All West Haven Fire Districts Kilo = Storm Ambulance Coprs of Derby Papa = Hunters Ambulance Zulu = Lower Naugatuck Valley Paramedic Service The third number is the actual agency unit number. So 2 Bravo 7 would be ambulance 7 from Ansonia with a EMT & MRT responding. 5 Alpha 1 would be New Haven Fire's Emergency Paramedic unit 1 There are 5 EMS regional agencies and each use a slightly different system but units on C-MED radios universally have a town designation to them (all of Connecticut's Towns have a tax ID number associated with them and are used by several police departments and CSP). Joe