The air forces of South Korea and the US have stepped up their joint air exercises, Yonhap news agency reported. "The Freedom Flag exercise began on Monday for a two-week run at the Kwansan Air Force Base, about 180 km southwest of Seoul, which included the main air assets of the Allies, including the South Korean Air Force's F-15K, KF-16 and F-35A," it said. According to Yonhap, “KC-330 and E-737 Peace Eye early warning transport aircraft and control aircraft will also be deployed for the exercise. The US Air Force's F-16 fighter jet, RC-135 fighter jets and the Navy's MH-60S unmanned surveillance aircraft, as well as the US Marine Corps' F-35B fighter jet and MQ-9 Reaper unmanned surveillance aircraft will also participate in the exercises."