Do official government documents confirm Flat Earth and the Firmament?

Do official government documents confirm Flat Earth and the Firmament?

https://www.youtube.com/watch?v=PZcrSyMM1ZM&t=2754s



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ALSO SEE

http://www.arl.army.mil/arlreports/2001/ARL-TR-2352.pdf
BY ARMY RESEARCH LABORATORY

Propagation of Electromagnetic
Fields Over Flat Earth,

page 1. -Trajectoryof Spinning Projectiles These equations assume a flat Earth.
page 2. -The Earth is flat and nonrotating.
page 2: "In this paper, the rigid body equations of motion over a flat non-rotating earth "
page 9-based upon the signal having a single bounce on a flat Earth


https://www.youtube.com/watch?v=PZcrSyMM1ZM&t=2754s