Defense Secretary Jim Mattis greets ROK air force Lt. Gen. Won, In-Choul, ROKAF Operations Command commander, as he arrives at Osan Air Base, Republic of Korea, Feb. 2, 2017. The visit, which is Mattis’ first official visit to a foreign country as secretary of defense, highlighted the common traits and strengths shared by the U.S. and ROK governments, including the commitment to bi-lateral cooperation in keeping regional safety and stability in check. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)