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A U.S. Air Force F-35A Lightning II assigned to Hill Air Force Base, Utah, conducts a training flight with F-16 Fighting Falcons assigned to Kunsan Air Base, Republic of Korea over the city of Gunsan, ROK, Dec. 1, 2017, in preparation for VIGILANT ACE 18. This marked the first time the fifth-generation aircraft partook in the exercise, giving commanders a broader range of options when conducting operations in support of air tasking orders