What does R&S stand for in CBRN R&S?

• A. Reconnaissance and Surveillance
• B. Response and Security
• C. Reporting and Synthesis
• D. Reconnaissance and Science

Answer: (A)

In CBRN operations, you need both a quick snapshot of the situation and ongoing monitoring to stay ahead of changes. That combination is Reconnaissance and Surveillance. Reconnaissance involves gathering timely information about a specific area or incident to identify hazards, contamination, routes of exposure, and where the threat or affected areas are concentrated. Surveillance is about continuous monitoring over time—tracking how conditions evolve, detecting spread or changes in hazard levels, and maintaining awareness to support decisions.

For example, a reconnaissance team might confirm the presence and extent of a contaminant in a zone and identify access routes, while surveillance would continuously monitor air or ground conditions with sensors to notice any shift in threat level or plume movement. This pairing lets responders quickly understand the current picture and then keep updating it as the situation develops, guiding protective actions and decontamination efforts.

The other options don’t reflect the standard pairing used in CBRN doctrine. They describe different functions (like post-incident actions, data processing, or a field-focused discipline) that aren’t the established term for the combined activity of rapid information gathering and ongoing monitoring. Reconnaissance and Surveillance is the recognized meaning.