I remain skeptical about UFOs being interstellar craft from some intergalactic civilization. Why would a civilization that has mastered interstellar travel and thus technology to travel faster than light or utilize wormholes want to travel here apparently repeatedly? What would they want here? If according to the famous Drake equation there are huge numbers of civilizations in the galaxy, why pick here? If invasion or enslavement were their motive, that likely would have happened. I suppose intellectual curiosity could be a reason, but still why here?
As for the government having retrieved extraterrestrial space craft or alien bodies, again I’m skeptical. The ability for our government to keep secrets for decades especially these days when a low ranking Air Force reservist can access virtually anything secret makes me wonder if such revelations would still be secret.
And why so secretive?