U.S. Air Force Capt. Ernie Chen, 961st Airborne Air Control Squadron evaluator electronics combat officer, coordinates air operations with a team of Airmen who belong to various units across the globe at the Hardened Theater Air Control Center, Osan Air Base, Republic of Korea, during the first day of Ulchi Freedom Guardian, Aug. 17, 2015. UFG is a realistic training event focused on preparing, preventing and prevailing against the full range of current and future threats to the ROK and the region. (U.S. Air Force photo by Airman 1st Class John Linzmeier)