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Capt. Jacob Yarnell, 35th Fighter Squadron F-16 Fighting Falcon pilot, conducts a preflight systems check during Vigilant Defense at Kunsan Air Base, Republic of Korea, Oct. 28, 2023. Combined training and exercises are defensive in nature, intended to build combat readiness and ensure we are ready to “Fight Tonight.” (U.S. Air Force photo by Senior Airman Karla Parra)