Senior Airman Spencer Hensinger, 28th Maintenance Squadron aircraft structural maintenance technician, uses an orbital sander to remove defects at Ellsworth Air Force Base, S.D., April 3, 2012. Filler is applied to dents then sanded down to maintain the integrity and smoothness of the part intact and free of flaws. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)