“Affirmative”
Yes or acknowledgment.
Officer needs assistance:
Code indicating distress or emergency backup.
All units:
Alert for all available units.
BOLO:
Be On the Lookout (for suspects or vehicles).
ETA:
Estimated Time of Arrival.
Negative:
No, not understood or denial.
Affirmative:
Yes, understood.
Code 1:
Immediate response is required, in emergencies (equivalent to lights and sirens).
Code 2:
Urgent, but not an emergency – no lights and sirens.
Code 3:
Routine – no immediate urgency, normal response.