Sheet Metal
Senior Airman Spencer Hensinger, 28th Maintenance Squadron aircraft structural maintenance technician, uses an orbital sander to remove defects on a B-1 bomber spoiler at Ellsworth Air Force Base, S.D., April 3, 2012. It is critical that aircraft parts like the spoiler be as smooth and aerodynamic as possible to ensure proper flight characteristics. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)