7/23/2013 - An
Airman takes cover under a desk while in mission-oriented protective
posture four during an Operational Readiness Exercise at Joint Base
Pearl Harbor-Hickam, Hawaii, July 18, 2013. MOPP four is primarily used
during post-attack reconnaissance, when a chemical, biological,
radiological or nuclear attack is in progress or when CBRN contamination
is present or suspected. (U.S. Air Force photo/Tech. Sgt. Jerome S.
Tayborn)
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