A U.S. Air Force U-2 spy plane takes off on the runway at the Osan U.S. Air Base in Pyeongtaek, South Korea, Monday, Aug. 21, 2017. (Lee Sang-hack/Yonhap via AP) ** FILE **
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A U.S. Air Force U-2 spy plane takes off on the runway at the Osan U.S. Air Base in Pyeongtaek, South Korea, Monday, Aug. 21, 2017. (Lee Sang-hack/Yonhap via AP) ** FILE **
