U.S. Air Force Senior Airman Brennen Bychinski, 99th Civil Engineer Squadron heavy equipment operator, blocks off an entryway prior to a simulated chemical attack during an Operational Readiness Exercise March 21, 2012 at Nellis Air Force Base, Nev. The ORE tested Airmen's ability to survive and operate in a chemical environment while continuing with daily operations. (U.S. Air Force photo by Staff Sgt. Christopher Hubenthal)
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