Do you think aliens in ufos have visited Earth? (And all things UFO)

I have always believed that we are being visited, but had no actual proof. There have been sightings by some very reputable people however.....if any of you have seen the documentary about the Tic Tac encountered by the Nimitz battlegroup, one of my very best friends was the OSC AIC onboard the Princeton that tracked them and controlled the F/A 18's that went after them. I believe everything he stated in that documentary because I know the man very well. We served together for years and that sighting was just after I retired. If he says they weren't of this world, you can bet on it.

Edit: I should clarify my first statement...I have always believed in the possibility that we are being visited, but have no actual proof....also, if you DO believe or want more info check out the first two episodes of season one...https://play.history.com/shows/unidentified-inside-americas-ufo-investigation/season-1