Airmen from the 25th Aircraft Maintenance Unit load munitions onto an A-10 Thunderbolt II during the Vigilant Ace 16 exercise on Osan Air Base, Republic of Korea, Nov. 1, 2015. Exercises such as this help test team Osan's ability to survive and operate in wartime constraints. The weapons Airmen from the 25th AMU are responsible for 10 varieties of conventional munitions that can be loaded onto the A-10 frame. (U.S. Air Force photo/Senior Airman Kristin High)