Defense Secretary Jim Mattis greets U.S. Army Gen. Vincent K. Brooks, United States Forces Korea commander, as he arrives at Osan Air Base, Republic of Korea, Feb. 2, 2017. The importance of the Asia-Pacific region was a vital message of Mattis' visit, where he demonstrated the U.S.'s desire to find even deeper common ground with allies to further enhance collaboration and cooperation in the region. (U.S. Air Force photo by Staff Sgt. Victor J. Caputo)