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In this August 18, 2010, file photo, South Koreans wearing gas masks escape from a mock smoke attack during an anti-terror exercise carried out as part of Ulchi Freedom Guardian exercise, against possible attacks from North Korea in Seoul, South Korea. The Ulchi Freedom Guardian drills set to begin Monday, Aug. 21, 2017 will be the first joint military exercise between the allies since North Korea successfully flight-tested two intercontinental ballistic missiles in July and threatened to bracket Guam with intermediate range ballistic missile fire in August. (Photo by Lee Jin-man/AP Photo)
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