U.S. Air Force Capt. Brittany Trimble, a 13th Fighter Squadron F-16 Fighting Falcon pilot, waits to taxi out of a harden aircraft shelter during VIGILANT ACE 18 at Osan Air Base, Republic of Korea, Dec. 4, 2017. More than 280 personnel relocated to Osan AB for the annually held exercise, further enhancing the region’s joint and bilateral readiness among sister services and Indo-Asia- Pacific allies. (U.S. Air Force photo by Staff Sgt. Deana Heitzman)