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Visitors looks at models of North Korea’s Scud-B missile, center left, and other South Korean missiles on display at the Korea War Memorial Museum in Seoul, South Korea, Tuesday, September 15, 2015 (Credit: AP Photo/Ahn Young-joon)

Visitors looks at models of North Korea's Scud-B missile, center left, and other South Korean missiles on display at the Korea War Memorial Museum in Seoul, South Korea, Tuesday, September 15, 2015 (Credit: AP Photo/Ahn Young-joon)