[newt_slowly]

"Almost certainly"?

We all have our hypotheses, and by all means promote yours, but do you really feel you have enough evidence to assign such a high confidence to yours? How do you reconcile it with statements like the following, made by the former director of National Intelligence?

"There are a lot more sightings than have been made public. Some of those have been declassified. And when we talk about sightings, we are talking about objects that have seen by Navy or Air Force pilots, or have been picked up by satellite imagery that frankly engage in actions that are difficult to explain. Movements that are hard to replicate that we don’t have the technology for. Or traveling at speeds that exceed the sound barrier without a sonic boom."

[gregw134]

Ok, I changed the wording to "in my opinion". My main point is that it might be possible to build drones matching this description with existing technology. There is existing technology to induce controlled rotation in satellites, using control moment gyroscopes:

https://en.wikipedia.org/wiki/Control_moment_gyroscope

Perhaps if you placed a control moment gyroscope inside a helium-filled sphere, an operator could generate a controlled rapid spin. I'm not an expert by any means, was hoping someone more knowledgable can evaluate the idea.