That’s another way of saying it wasn’t aliens, it was the military.
This is orders of magnitude more complicated than most folks think—one place to start is this podcast:
https://podbay.fm/p/aliens-and-artists/e/1645119331
Semivan is a retired CIA guy calling it as he see it.
If after listening to him you think it is disinformation, fine—but he deserves to be heard.