Osan Arrival Defense Secretary Jim Mattis arrives at Osan Air Base, South Korea, Oct. 27, 2017. Mattis is meeting with allies and partners in the region to discuss security challenges and shared interests. DoD photo by Army Sgt. Amber I. Smith SHARE: Download: Full Size (1.85 MB) Credit: Amber I. Smith VIRIN: 171027-D-SV709-038.JPG Photo Gallery