civilian-claim1948· Franklin, Kentucky

On January 7, 1948, Kentucky Air National Guard Captain Thomas Mantell died when his P-51 Mustang crashed near Franklin, Kentucky, after he climbed in pursuit of a large, luminous object tracked by multiple control towers and reported by civilian witnesses; he was the first U.S. military pilot to die during a UFO pursuit.

Godman Army Airfield operators described the object as 250–300 feet in diameter. Project Blue Book later concluded Mantell had chased a classified Skyhook balloon at altitude, losing consciousness from hypoxia, but Skyhook was not publicly known in 1948, and no balloon wreckage was recovered near the crash site.

Citations

Mantell UFO incident· Wikipedia, 2024
Questions remain 75 years after mysterious Fort Knox UFO incident, downed pilot· United States Army, 2023
Project Blue Book: The Thomas Mantell Case, 7 January 1948· The Black Vault, 2020

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