On WMD responses, the first due engine shall:

The first due engine's correct action in a Weapons of Mass Destruction (WMD) response is to stop at least 500 feet away or where debris is first encountered. This approach is critical for ensuring the safety of first responders and avoiding exposure to potential hazardous materials or secondary explosions. By maintaining a safe distance, responders can assess the situation and determine the appropriate measures to take without putting themselves at risk.

In the context of a WMD incident, there could be numerous unseen dangers, including toxic gases, radiation, or other hazardous substances that might be released. Approaching too closely without proper protective equipment can lead to contamination or injury.

Maintaining a significant distance allows for the establishment of a safe perimeter and gives the command team time to evaluate the scene effectively. From this point, they can implement decontamination and establish command and control procedures in a safe manner, all while mitigating the risk to responders and civilians in the area.