What should be the number one operational priority in perimeter control?

In perimeter control during firefighting operations, utilizing established wildland firefighting tactics is essential because these tactics focus on creating defensible spaces around structures and managing the fire's spread. Effective perimeter control is critical to prevent fire from advancing further, protecting both life and property.

Using these established tactics allows firefighters to strategically position themselves and equipment to combat the fire actively while understanding the behavior of the fire in relation to the terrain and vegetation. This approach underscores the importance of having a well-defined plan that considers the dynamics of the fire and the environment.

The other options, while important in their own contexts, do not represent the primary focus for perimeter control. Establishing communication is vital, but if the perimeter is not effectively controlled, communication alone will not prevent a fire from spreading. Assessing structural integrity and gathering equipment are also important, but they become secondary to the need for controlling the fire's perimeter for effective overall incident management.