Senior Airman Benjamin Amirault, 28th Civil Engineer Squadron structures technician, uses a belt sander to round the corners of a traffic sign at Ellsworth Air Force Base, S.D., Aug. 15, 2013. Technicians flatten the corners of each sign to provide a finished product free of sharp edges. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)