Which term refers specifically to an active means of observation and collection regarding CBRN threats?

The correct term that refers specifically to an active means of observation and collection regarding CBRN threats is CBRN Reconnaissance. This term encompasses the systematic process of actively searching for and gathering information about chemical, biological, radiological, and nuclear threats in a designated area.

CBRN reconnaissance involves a range of tactical and operational techniques, including the use of specialized equipment and trained personnel who can identify and characterize hazardous agents in real-time. This proactive approach distinguishes it from other related concepts because it emphasizes on-the-ground investigation and immediate assessment, which is crucial in effectively mitigating potential CBRN incidents.

In contrast, CBRN surveillance typically refers to ongoing monitoring efforts that may not involve immediate hands-on investigation but rather the collection of data over time. While both surveillance and reconnaissance aim to enhance situational awareness, reconnaissance is actively oriented towards identifying threats as they emerge.

Overall, the emphasis on active observation and immediate response to CBRN threats solidifies CBRN Reconnaissance as the appropriate choice here.