In a commercial structure fire, how many units are included in the second alarm response?

In a commercial structure fire, the second alarm response typically involves a specific number of units that are dispatched to effectively manage the increased complexity of the situation. The correct answer includes several specialized units: LA (Ladder Apparatus), FM (Fire Marshal), MAST (Mobile Air Supply Truck), SC1 (Safety Command Unit), MC1 (Medical Command Unit), and UAS (Unmanned Aerial System). This diverse mix of units is designed to enhance operational capacity by addressing various aspects of fireground operations, including aerial operations, safety oversight, medical support, and situational awareness.

This multi-faceted response is essential in commercial fires due to the potential for larger buildings, higher occupancy, and the complexity of firefighting tactics required. Each unit plays a distinct role in ensuring a safe and effective firefighting effort, thus emphasizing the need for a robust second alarm response in such scenarios.