Which tactical activity requires technician-level training?

The correct answer, plugging or patching, necessitates technician-level training because it involves specific skills and techniques that ensure the safe and effective management of hazardous materials incidents. Technicians in this area are trained to assess and mitigate leaks or spills from containers that may hold substances like chemicals or petroleum. This activity requires knowledge of various materials, containment techniques, and the use of specialized equipment to properly address the leak without causing further environmental or safety hazards.

In comparison, setting up incident command, conducting hazard assessments, and basic fire suppression are essential skills for firefighters but do not necessarily require the advanced level of training that plugging or patching does. These functions can be performed by entry-level firefighters or those with basic training, as they focus primarily on organizational procedures or foundational fire response techniques.