During Operation Team Spirit, a major joint US-South Korea military exercise, four Korean Air Force pilots intercepted a disc-shaped craft estimated at three times the size of an F-4 Phantom. The object emitted intense sparks and executed flight trajectories impossible for any known aircraft before vanishing. The encounter was corroborated by Air Vice Marshal Im Byungsun and two colonels. Part of a recurring pattern of UAP activity observed during large-scale international military exercises.