In addition to what others said; I've always thought all the released footage, pictures, etc from hearings and actual government sources was a way of the U.S to flex it's covert weapons/air programs. Civilians could never hope to access that information and get told only what they want to hear by intelligence-connected folks and other nations get to wonder either or not it's actually U.S tech. Another person made as point that it requires immense energy to travel interstellar distances. All the footage we've seen of "UFOs" have been on Earth, not in space or in satellite detection.

There was a thread a while back that asked if the U.S would beat China in direct conflict. Barring nukes, I do still think China would be successful in the long run; but we'd see some insanely ghoulish shit right out of trillion dollar laboratories and whatever horrible shit is in the Pandora's box of the M.I.C that they're flexing right in front of us through Jet-fighter footage.

At a job I worked a long time ago, I had a supervisor who was a polejockey in the D.I.A. He was extremely, extremely tight-lipped on everything. The only thing he ever told me is that America had a vast (he heavily emphasized "vast"), sprawling complex of underground railroads and loading stations built during the Cold War in order to mask deployments or military loads from satellites or espionage. Doesn't mean they still wont use above-ground railroads; it's just how they hide a lot of more sensitive things.

So with that infrastructure in mind, the trillions of dollars that have been siphoned out of the Pentagon and the relative power of the M.I.C and intelligence community; I don't doubt for one bit that 90% of what we see is just the U.S flexing their super-expensive toys.