If the incident commander decides to allow the building of origin to burn until additional resources arrive, it is considered ______ mode.

• A. A standby
• B. A rescue
• C. An offensive
• D. A defensive

Answer: (D)

This item tests understanding of when to adopt defensive firefighting mode. Defensive mode means focusing on containing the fire from the exterior and protecting exposures rather than conducting an interior attack. When the incident commander decides to let the building of origin burn until additional resources arrive, the strategy shifts to exterior suppression and perimeter control. Crews stay outside or at safe distances, use hoselines from outside, and prioritize preventing spread to nearby structures and exposures while awaiting more personnel or equipment. This approach reduces the risk to firefighters when conditions inside are too dangerous for entry, or when resource levels aren’t yet sufficient for a safe interior attack. It’s not about rescuing occupants or launching an interior assault, which would align with rescue or offensive modes, respectively; standby isn’t about a tactical posture for suppression.