PMD Codes
The designations that you hear ALPHA, BRAVO, CHARLIE, DELTA, and ECHO, are known as part of the PMD coding system found here in Delaware and other places. There will often times be 2 numbers associated with the A, B, C, D, or E. Such as 29D4 which would be a MVC with rollover and a 31C1 Unconcious/Fainting. These are to help the responding units weather it be the ambulance, paramedics, or fire department understand with all the info the dispatcher has what is actually going on prior to their arrival.