Airman 1st Class Anthony Edgar, 20th Component Maintenance Squadron technical maintenance data equipment technician, tests the accuracy of a digital micrometer by using precisely pre-measured gage blocks at Shaw Air Force Base, S.C., May 17, 2013. The micrometer measures anything that has diameter or length like landing gear pins, clamps and frames used to ensure landing capabilities of the F-16 Fighting Falcons. (U.S. Air Force photo by Airman 1st Class Krystal M. Jeffers/Released)