Members of the South Korean Special Weapons and Tactics team (SWAT) aim their weapons during a simulated chemical terrorism crisis as part of an anti-terror drill on the sidelines of the Ulchi Freedom Guardian (UFG) military exercises at the Korea International Exhibition & Convention Center (KINTEX) in Goyang, South Korea, on Monday, Aug. 21, 2017. South Korean President Moon Jae-in warned North Korea not to use his nations latest round of annual military drills with the U.S. as an excuse for any further provocations. Photographer: SeongJoon Cho/Bloomberg via Getty Images