What code shall be used on all department radios for a bomb threat?

The correct code to use on all department radios for a bomb threat is 721. This code is a standardized designation within many fire and emergency service organizations, specifically used to discreetly communicate the presence of a bomb threat without causing widespread panic or drawing unnecessary attention in public settings.

Using a specific code helps maintain operational integrity and ensures that all responding personnel are aware of the situation without alarming the public. This practice is crucial in enhancing the safety of first responders and civilians alike, as it facilitates a coordinated and efficient response to potentially hazardous situations.

The other codes listed have different specific meanings or uses within department protocols, and they do not pertain to bomb threats. Understanding the importance of using designated codes can help ensure that all personnel remain informed and work effectively during emergencies.