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U.S. Air Force Airman 1st Class Joshua Arteaga, 99th Aerospace Medicine Squadron bioenvironmental engineer apprentice, wears a gas/oxygen mask used by first responders during emergency response in the event of a mishap July 23, 2013, at Nellis Air Force Base, Nev. The gas/oxygen mask is worn under a level A suit, which protects Airmen from hazards ranging from chemical, biological, radiological or nuclear exposure when working around unknown materials. (U.S. Air Force photo by Senior Airman Daniel Hughes)
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