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A South Korean armed policeman wears a g...A South Korean armed policeman wears a gas mask during an anti-terror drill on the sidelines of South Korea-US joint military exercise, called Ulchi Freedom Guardian, at a subway station in Seoul on August 19, 2015. Tens of thousands of South Korean and US troops on August 17 began a military exercise simulating an all-out North Korean attack, as Pyongyang matched Seoul in resuming a loudspeaker propaganda campaign across their heavily-fortified border. (Photo by Jung Yeon-Je/AFP Photo)
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