Airmen check one another’s seal during chemical, biological, radiological, nuclear and environmental training at Ellsworth Air Force Base, S.D., March 23, 2018. Emergency management Airmen from the 28th Civil Engineer Squadron work with the 28th Logistics Readiness Squadron and 28th Medical Operations Squadron bioenvironmental engineering flight to keep Ellsworth AFB Airmen proficient with their mission oriented protective posture gear. (U.S. Air Force photo by Airman 1st Class Donald C. Knechtel)
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