Project Blue Book Case #3213. On September 18, 1954, an unidentified object was observed at Kimpo Air Base (now Gimpo International Airport) near Seoul, South Korea. Kimpo had been the primary military airfield in the Seoul area throughout the Korean War and remained a major U.S. Air Force installation after the July 1953 armistice.
The armistice had ended active combat but left the two Koreas technically still at war, separated by the Demilitarized Zone just 30 miles north of Seoul. American air units at Kimpo maintained combat readiness, and the identification of every aircraft in Korean airspace remained critical — violation of the armistice by either side could reignite the conflict.
September 1954 coincided with the great European wave. Whether the Korean sighting was related to the broader global pattern is unknown, but the timing placed it within the same period of worldwide heightened activity.
The object could not be identified through Far East Air Forces channels. The case was classified "Unknown."