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Staff Sgt. Paolo Melendez, 31st Aerospace Medicine Squadron bioenvironmental engineering radiation protection safety manager, tests an unknown powder during a training exercise, Dec. 17, 2013, at Aviano Air Base, Italy. At bioenvironmental engineering, Airmen take measures to prevent four different base-hazard elements: Industrial hygiene, radiation protection, environmental protection and occupational health. (U.S. Air Force photo/Airman Ryan Conroy)
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