ARFF personnel must sound the proper withdrawal signal when ______.

• A. A vehicle approaches
• B. Munition have become involved in a fire
• C. After the incident is contained
• D. When a civilian requests aid

Answer: (B)

Munitions involved in a fire create an explosive hazard that can detonate unpredictably, producing a powerful blast and flying debris. Because of that risk, ARFF crews must retreat to a safe distance and sound the withdrawal signal so everyone stops work and moves away from the danger. This keeps personnel from being caught in a secondary explosion and allows incident command to reassess the scene and ensure a safe plan before any further actions. Other situations, like a vehicle approaching, the fire being contained, or a civilian requesting aid, do not by themselves create the same immediate explosive threat that requires a withdrawal.