Here is the video:
https://my.mixtape.moe/amgwtc.webm
The original post:
https://boards.4chan.org/x/thread/20367298
Copied Here:
DECLASSIFIED. US government "high G" reverse engineered UFO does tight turns at nearly mach 1
This is the first public release of this material.
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Your forum has been chosen as a potential avenue of soft disclosure. Depending on how well the material is disseminated further, more material may follow in the future.
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This video has been declassified by order of general Mattis with the full support of the president of the United States and all branches of government.
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Material info:
Location: 37°1406N 115°4840W
Date: 2nd of January 1984 13.12.05
Filetype: .webm, 640x480, 30 FPS.
Might be a fake, but the area in the video certainly looks like the area immediately surrounding the base.