U.S. Air Force Airman 1st Class Ryan Celestino, 909th Aircraft Maintenance Unit instrument and flight control systems journeyman, inspects the digital speed indicator of a KC-135R March 15, 2017, at Kadena Air Base, Japan. Instrument and flight control systems Airmen constantly fix and repair instruments on aircraft to ensure safety. (U.S. Air Force photo by Senior Airman Omari Bernard)