Staff Sgt. Matthew Rosenfeldt, 22nd Aerospace Medicine Squadron Industrial Hygiene Element NCOIC, surveys the amount of hazardous noise levels March 18, 2011, McConnell Air Force Base, Kan. The Dilworth, Mont., native conducts surveys and measurements to ensure Airmen are properly protected and able to complete the mission. (U.S. Air Force photo/Airman 1st Class Armando A. Schwier-Morales)
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