Members from U.S. and Republic of Korea militaries man the Hardened Theater Air Control Center, at Osan Air Base, ROK, during the first day of Ulchi Freedom Guardian, Aug. 17, 2015. UFG is held annually to strengthen the U.S.-ROK alliance commanders’ and staff members’ ability to translate information into actionable decision-making. Portions of the image were blurred for security concerns. (U.S. Air Force photo/Airman 1st Class John Linzmeier)

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. Portions of the image were blurred for security concerns. (U.S. Air Force illustration/Airman 1st Class John Linzmeier)

Republic of Korea Air Force Capt. Won Jung Seung, 6th Rescue Group pilot, monitors ROK air space at the Hardened Theater Air Control Center, Osan Air Base, ROK, during the first day of Ulchi Freedom Guardian, Aug. 17, 2015. Part of Won’s responsibility is to receive and relay vital information to commanders in order to support air rescue operations. UFG is an annual exercise that brings together U.S., ROK and other allied forces in an effort to ensure readiness to defend the ROK and help maintain stability on the Korean Peninsula. (U.S. Air Force photo by Airman 1st Class John Linzmeier/Released)

U.S. Army Sgt. Dennis Franklin, Headquarters and Headquarters Company Management Command Yongsan air traffic controller, monitors air space throughout the Indo-Asian-Pacific region at the Hardened Theater Air Control Center, Osan Air Base, Republic of Korea, during the first day of Ulchi Freedom Guardian, Aug. 17, 2015. Approximately 33,000 Airmen, Soldiers, Sailors and Marines from Osan, the Pacific theater and the United States along with other allied militaries are participating in the annual exercise in an effort to enhance the combat readiness of the ROK and U.S. forces. Months of planning went into UFG, preparing joint teams on the operations floor to work together and maximize their collaborated efforts. Portions of the image were blurred for security concerns. (U.S. Air Force illustration by Airman 1st Class John Linzmeier/Released)