U.S. Air Force Staff Sgt. Jessica Fileas, 633rd Aerospace Medicine Squadron radiation program noncommissioned officer in charge, checks an electronic personal dosimeter’s serial number while conducting inventory at Langley Air Force Base, Va., Oct. 8, 2015. The device measures exposure to ionizing radiation for the purpose of human radiation protection. (U.S. Air Force photo by Senior Airman Aubrey White/Released)