South Korean firefighters simulate a response to a potential chemical weapons attack while wearing protective gear at the Yoido Subway Station in Seoul on Aug. 23, 2016. First responders and U.S. and South Korean soldiers conduct such drills during the annual Ulchi Freedom Guardian exercise, the latest of which is scheduled to start next week in South Korea.
South Korean firefighters simulate a response to a potential chemical weapons attack while wearing protective gear at the Yoido Subway Station in Seoul on Aug. 23, 2016. First responders and U.S. and South Korean soldiers conduct such drills during the annual Ulchi Freedom Guardian exercise, the latest of which is scheduled to start next week in South Korea. Ahn Young-joon AP
South Korean firefighters simulate a response to a potential chemical weapons attack while wearing protective gear at the Yoido Subway Station in Seoul on Aug. 23, 2016. First responders and U.S. and South Korean soldiers conduct such drills during the annual Ulchi Freedom Guardian exercise, the latest of which is scheduled to start next week in South Korea. Ahn Young-joon AP

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