An F-35A Lightning ll streaks across the runway at Kunsan Air Base, Republic of Korea, as it lands during the annual exercise VIGILANT ACE 18, Dec. 4, 2017. The F-35A, assigned to Hill Air Force Base, Utah, was located at Kunsan as part of the regularly scheduled exercise, marking the first time fifth-generation aircraft participated in an operational readiness exercise on the Korean Peninsula. In October 12 F-35As forward deployed to Kadena Air Base, Japan, as part of a Theater Security Package in support of U.S. Pacific Command priorities. (U.S. Air Force photo by Staff Sgt. Victoria H. Taylor)