U.S. Air Force Staff Sgt. Shawn Monteer, 8th Maintenance Squadron conventional maintenance crew member, tightens the bolts on the tail wing of a Guided Bomb Unit 31 version 3 during the Combat Ammunition Production Exercise at Kunsan Air Base, Republic of Korea, June 5, 2017. Airmen involved in CAPEX were evaluated on their ability to generate munitions in a total force environment. (U.S. Air Force photo by Senior Airman Colville McFee/Released)