U.S. Air Force Airman 1st Class Lonnie Jessie, a 35th Aircraft Maintenance Squadron crew chief, waits to refuel an F-16 Fighting Falcon prior to VIGILANT ACE 18 at Osan Air Base, Republic of Korea, Dec. 1, 2017. More than 280 personnel arrived at Osan AB fully equipped and ready to participate in the annually held flying exercise. During the training, 35th Fighter Wing Airmen embed with 51st FW Airmen, ensuring seamless operations for the duration of the exercise.(U.S. Air Force photo by Staff Sgt. Deana Heitzman)