Which is one of the CBRN PASSIVE DEFENSE operational elements?

• A. CBRN shape
• B. CBRN sense
• C. CBRN shield
• D. CBRN sustain

Answer: (C)

Passive defense in a CBRN environment centers on measures that protect personnel and maintain operations without requiring active countermeasures after exposure. Shield is the protective element: it encompasses the use of personal protective equipment, protective clothing, shelters, barriers, and other means that form a physical shield between people and the contaminant. By blocking or reducing contact and limiting contamination, shielding directly lowers the dose people receive and helps them stay ready to operate in a hazardous environment.

Other elements focus on different functions—sensing involves detection and warning to know when danger is present, shaping refers to adjusting plans and posture to reduce risk before exposure, and sustaining means keeping the unit supplied and capable under CBRN conditions. Shield uniquely provides the direct protective barrier that minimizes exposure, which is why it’s the correct choice.