Which term is described as a method of air replacement and rehydration for companies while maintaining their sector assignment?

The term that describes a method of air replacement and rehydration for fire companies while maintaining their sector assignment is "Restoration." This approach is essential in fire service operations, especially during extended incidents where firefighting personnel may face fatigue or dehydration.

Restoration refers to the systematic process of ensuring firefighters remain operationally ready by replacing the air in their breathing apparatus and providing hydration, all while they continue to function effectively in their designated roles. This method allows teams to maintain their effectiveness and readiness without the need for a complete withdrawal from their assignments.

In fire operations, it's crucial to sustain both the physical and mental capabilities of personnel, especially during long incidents. Restoration ensures that firefighters can recuperate briefly without being pulled away from their critical tasks, thus enhancing overall safety and performance during emergencies.