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U.S. Air Force Senior Airman Nicholas Johnson, 99th Aerospace Medicine Squadron bioenvironmental engineer journeyman, squeezes a water sample from a syringe into a test container July 23, 2013, at Nellis Air Force Base, Nev. Bioenvironmental Airmen take samples of substances at mishap scenes to gather information to ensure the safety of the people who may enter a contaminated environment that may have been exposed to harmful substances. (U.S. Air Force photo by Senior Airman Daniel Hughes)
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