An F-16 Fighting Falcon flies alongside a KC-135 Stratotanker as part of an air defense exercise, October 9, 2019, at Altus Air Force Base, Okla. Training like this is essential in evaluating the military and Department of Defense’s response actions to an aircraft incident and to prepare in the most realistic manner. (U.S. Air Force photo by Airman 1st Class Breanna Klemm)