If either of these two jurisdictions are like our local area they are telling the responders how to respond (with either lights and sirens or routine). Response levels are usually determined after questioning using a set of pre-arrival instructions (Emergency Medical Dispatching) or EMD for short. Different EMD instructions, agencies, services, and medical control use different codes for what is basically the same thing. Priority 1, Alpha, or Code 3 are all terms used for a response level of lights and sirens (most severe medical problem or injury). Priority 2, Bravo (or in some cases Charlie), Code 2 would mean a routine response (sick person, non-trauma). Priority 3, Code 1, Delta may something like a patient transfer. There is also an omega response but I can't remember what that means at this moment This type of system was developed basically for the safety of responders and for the public while the responders were en route to a call. As a result of EMD responders are only having to drive at an increased speed when necessary. Also, by using EMD the dispatcher is able to give instruction to the caller while responders are en route. I hope this helps (and more importantly) is the correct answer as again, I am only assuming that this is what GB and Waukesha are doing. Good day