Tech. Sgt Kenan Harvey, 309th Expeditionary Depot Maintenance avionics technician, tests a fiber optic cable for signal loss at Hill Air Force Base, Utah, Sept. 12, 2019. The Air Force Sustainment Center and Air Force Research Laboratory worked with the 309th Aircraft Battle Damage Repair and Expeditionary Depot Maintnenace team to field test fusion repairs on fifth-generation aircraft. (U.S. Air Force photo by R. Nial Bradshaw)