US and South Korean militaries conducted air drills as part of a joint field training exercise called Warrior Shield, the South Korean Air Force said. In video footage provided by South Korea’s military, fighter jets including F-15Ks, F-35As and KF-16s were seen dropping various types of missiles and bombs which hit targets that exploded. South Korea’s Air Force said the five days of air-to-air live firing and air-to-surface bombing drills started on March 20.