U.S. Army Gen. Vincent K. Brooks, United States Forces Korea commander, escorts Defense Secretary Jim Mattis to an HH-47 helicopter at Osan Air Base, Republic of Korea, Feb. 2, 2017. Mattis is the first cabinet member of the Trump administration to visit the ROK, demonstrating the new administration’s continued commitment to work side-by-side with allied nations and stand firm with them in the face of regional threats. (U.S. Air Force photo by Staff Sgt. Jonathan Steffen)