Airman 1st Class Charles Cannon, 437th Maintenance Squadron Aerospace Ground Equipment technician, puts a face shield over his goggles for protection from the chemicals used to clean wheel bearing parts Aug. 6, 2013, at Joint Base Charleston – Air Base, S.C. Once the bearings have gone through the chemical bath, they are scrubbed with a brush to remove all traces of grease. (U.S. Air Force photo/Senior Airman Dennis Sloan)