U. S. Air Force Airmen learn how to protect an “asset” during a chemical, biological, radiological and nuclear defense survival skills training course on Oct. 28 2021, at Travis Air Force Base, California. CBRN defenses are protective measures taken in situations in which chemical, biological, radiological or nuclear warfare hazards may be present. CBRN defense consists of CBRN passive protection, contamination avoidance and CBRN mitigation. (U.S. Air Force photo by Heide Couch)
28.0-300.0 mm f/3.5-5.6
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