UFO seen by four pilots in Korea in 1951

Summary

In July 1951, four pilots in Korea simultaneously observed an unidentified aerial object. It was described as a large bright green ball trailing red streaks that turned blue. The object was moving at tremendous speed and was seen at an altitude of about 10,000 feet. Although initially considered a meteor, no definitive conclusion was reached. The report, classified and later declassified, was shared among several military agencies for analysis. The lack of additional details and the inability to identify the object with certainty add mystery to this case.