These are just secret weapons.
The bext UFO book ever written was
“INTERCEPT UFO”
by Renato Vesco.
He outlines and details the Boundary Layer Control experiments and theories laid down a hundred years ago by aeronautical luminaries Oscar Schrenk & Ludwig Prandtl.
The NAZIs glommed onto the research, were almost ready for production, and the war ended — the allies won. 2 years later we see prototypes flying all over the USA.
Intercept UFO: The True Story of the Flying Saucers! Mass Market Paperback – January 1, 1974
by Renato Vesco (Author)
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If Prandtl was actually involved, that lends automatic credibililty.