I saw one in the late 70’s In the daytime, flying very low - and there was NO sound or leaf movement.
I think they’re using stuff from a physics we don’t understand yet. It was like they’re moving within a tube and manipulating the background. Which would explain why it appears they’re defying reality and g factors. They’re not. Just manipulation we can’t do yet.
One of the big reveals was the testimony that the technology is based on the physics of a holographic universe.
Apparently some folks in .gov and private contractors actually understand how that works.
I have no clue.