Upon arrival at a commercial fire, what is NOT a responsibility of the Fire Marshal?

The responsibility of calling for the Photo Unit in all cases is not part of the Fire Marshal's duties upon arrival at a commercial fire. The Fire Marshal's primary role is to investigate and gather information about the incident, which includes assessing the scene, gathering evidence, documenting the incident, and ensuring that safety protocols are followed to protect all individuals on site as well as preserve the integrity of the investigation.

While the Photo Unit may be called to the scene for documentation purposes, it is not a mandatory action for every incident. The decision to involve the Photo Unit depends on various factors, including the specifics of the fire scene, the severity of the incident, and whether visual documentation is deemed necessary for the investigation. Thus, while gathering evidence, documenting the incident, and ensuring safety protocols are critical and common responsibilities of a Fire Marshal, calling for the Photo Unit in all cases is not a requirement.