Defense Secretary Jim Mattis, left, and Marine Corps Gen. Joe Dunford, chairman of the Joint Chiefs of Staff; participate in the 49th Security Consultative Meeting at the Ministry of Defense with their South Korean counterparts Minister of National Defense Song Young-moo and South Korea Air Force Gen. Jeong Kyeong-doo, chairman of South Korea’s Joint Chiefs of Staff, in Seoul, South Korea, Oct. 28, 2017. DoD photo by Navy Petty Officer 1st Class Dominique A. Pineiro