Hey Guys,
Just checking in here. I have 10 years of fire and EMS experience IRL. I have noticed on some Arma 3 Servers that community police like to use 10 codes. If you are going to go for realism on your server, I would like to tell you that the FCC here in America does not support the use of 10-codes for the very reason that it confuses people. If you were to encounter another police officer, fire department, or EMS unit from a neighboring town their 10 codes may not reflect your 10 codes. That is why the FCC tells you to use plain English.
The reason for the 10-codes was for quick radio traffic, and also so that people in scanner land wouldn't know what was happening.
Anyway, food for thought.