File - In this Saturday, Aug. 22, 2015 file photo, a South Korean army soldier walks along the military wire fences on Unification Bridge, which leads to the demilitarized zone, near the border village of Panmunjom in Paju, South Korea. The Demilitarized Zone, a Cold War vestige, was created as a buffer zone in 1953 after the three-year Korean War, which ended with an armistice. That armistice has yet to be replaced with a peace treaty, leaving the Korean Peninsula in a technical state of war. About 28,500 U.S. troops are stationed in South Korea as deterrence against a potential aggression from North Korea. (AP Photo/Ahn Young-joon, File)

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