Project Blue Book
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Incident No. 122 - 5 April 1948, Holloman Air Force Base, New Mexico Three balloon observers saw an object very high in the sky, moving faster than any known aircraft and possessing a rounded indistinct form, which disappeared suddenly. Source (PDF)
Three balloon observers saw an object very high in the sky, moving faster than any known aircraft and possessing a rounded indistinct form, which disappeared suddenly.