Newly released 1952 U.S. Naval Intelligence Assessment of two films allegedly depicting UFOs captured in Montana and Utah - Their conclusion was the objects don't appear to be natural phenomena or man-made. They were perplexed by the acceleration, speed and unknown material they seemed to be made of

Full document: https://www.war.gov/UFO/?releaseDate=Release+05&release=05&type=.pdf&search=naval+photo#DOW-UAP-D098-Film-Analysis-of-Unidentified-Objects-1953

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