Airman 1st Class Ekaterina Morrissette, 437th Aircraft Maintenance Squadron crew chief, wears hearing protection as she marshals in a C-17 Globemaster III Aug. 27, 2012, at Joint Base Charleston - Air Base, S.C. Hearing protection is personal protective equipment that the Hearing Conservation Program requires Airmen to wear to minimize exposure to hazardous noise. (U.S. Air Force photo/Senior Airman Dennis Sloan)