An F-15C Eagle from the 44th Fighter Squadron flies during a training exercise Oct. 3, 2019, out of Kadena Air Base, Japan. One of the Eagle’s most important assets is the pulse-Doppler radar system, which enables pilots to look up at high-flying targets and down at low-flying targets without being confused by ground clutter as well as track targets that are beyond visual range. (U.S. Air Force photo by Senior Airman Cynthia Belío)