Which of the following is a CBRN surveillance task?

• A. Do maintenance on equipment
• B. Map terrain
• C. Monitor operations
• D. Schedule calibrations

Answer: (C)

CBRN surveillance centers on watching and tracking conditions, activities, and indicators to detect chemical, biological, radiological, or nuclear threats and to maintain timely awareness for an effective response. Monitoring operations embodies that role because it involves continuously observing ongoing activities, looking for signs of a CBRN event, and ensuring procedures and safety measures are in place.

Maintenance on equipment is about keeping gear functional, not about observing or detecting threats. Mapping terrain relates to understanding the environment, which supports planning but isn’t itself a surveillance action. Scheduling calibrations focuses on ensuring instruments read accurately, which is an assessment task for instrumentation rather than active threat surveillance.