The South Korean Air Force said in a press release today that South Koreas four F-15K fighters from Daegu Air Base carried out a joint drill this afternoon with US Air Force's two B-1B bombers from Guam and the US Marine Corps' four F-35B aircraft based in Japan. They conducted an air-to-ground bombing drill, which simulates a surgical strike of key enemy facilities, over the Pilseung range in the eastern province of Gangwon. The South Korean and the US Air Forces carried out a joint air defense exercise this afternoon on Aug. 31 to strongly counter North Koreas relatedly launches of ballistic missiles and development of nuclear weapons.