Zody, a Military Working Dog with the 51st Security Forces Squadron, and his handler patrol the night during Vigilant Ace 16 at Osan Air Base, Republic of Korea, Nov. 4, 2015. The peninsula-wide exercise tests the linkage between operational-level planners and tactical units, to include increased ROK air force participation. (U.S. Air Force photo/Staff Sgt. Amber Grimm)