U.S. Air Force Senior Airman Kimara Duncan, 94th Aircraft Maintenance Unit tactile aircraft maintainer, slides booties over her boots during routine maintenance on an F-22 Raptor at Langley Air Force Base, Va., Sept. 25, 2012. Duncan, like most crew chiefs, often works 10- to 12-hour shifts. (U.S. Air Force photo by Senior Airman Racheal Watson/Released)