Jessica Feil of Alliance Solutions Group,( left) holds up an air-partical sensor so that Technical Sgt. Justin Alexander, 436th Civil Engineer Squadron can read the screen during a simulated contamination exercise at Dover Air Force Base, Del. on Oct. 3, 2013. Alexander uses his hand to wipe away fog on the inside of his hazardous material suit. The exercise tested the bases ability to respond to a natural disaster and resulting contamination to water supplies. (U.S. Air Force photo/Greg L. Davis)
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