Which of the following is NOT a task during the Ladder company's defensive operations?

In the context of defensive operations for a company, understanding the primary tasks involved is vital. The option identified as not being a task during these operations is environment control. Defensive operations typically focus on strategies and actions taken to protect personnel, property, and equipment from damage, especially in the case of fire scenarios.

Lighting and power, elevated master streams, and fire control are all essential components of a defensive approach. Lighting and power are vital for ensuring that the area is safe for personnel and for improving visibility and operational effectiveness during emergency situations. Elevated master streams refer to the use of high-angle equipment or hoses that allow firefighters to deliver water to elevated locations, which is crucial in defensive operations to combat large fires effectively from a safe distance. Fire control is the overarching goal of all defensive tactics, as it directly relates to containing and extinguishing the fire while protecting surrounding assets.

In contrast, environment control, while it may play a role in broader operational practices, does not specifically align with the immediate tasks involved in defensive operations. This task is more related to managing the conditions and surroundings rather than directly engaging with the fire or protecting structures, thus making it the correct choice for what is NOT a task during the Ladder company's defensive operations.