A U.S. F-35 stealth fighter is seen during the press day of the 2017 Seoul International Aerospace and Defense Exhibition at Seoul Airport in Seongnam, South Korea, Monday, Oct. 16, 2017. South Korean and U.S. troops launched five days of naval drills on Monday, three days after North Korea renewed its threat to fire missiles near the American territory of Guam. (AP Photo/Ahn Young-joon)
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