The astronauts include "Buzz" Aldrin (Apollo 11, 1969, first manned moon landing, in the same year I graduated from high school and the year of the muddy Woodstock Festival in New York State), who appears in the movie, freely available at the YouTube website, based on the book Unacknowledged -- An Exposé of the World's Greatest Secret (2017) by Steven M. Greer, M.D., which includes some of the testimonies of "hundreds of military personnel, scientists and civilians who had top-secret access to Unacknowledged Special Access Projects (UDAPs)".
Astronomer J. Allen Hynek's The U.F.O. Experience, A Scientific Inquiry (1972) was written after he realized he was being tricked and used as a "debunker" by Project Blue Book. It was he who had invented the laughable marsh-gas explanation.
U.S. Air Force Major Donald E. Keyhoe's Aliens From Space (1973) is another classic of the genre.
The Coral and Jim Lorenzen books (the 60s) describe very many cases. Among the most impressive is the one in which Reverend Father W.B. Gill of the Boiani Anglican Mission in New Guinea in 1959 saw a spacecraft floating offshore and its occupants doing something on it, maybe repairing it. He waved at them and they waved back but showed no interest in approaching him. They were just trying to be polite, which is not a universal behavior, as the nasty examples show. It's not just us, but that doesn't justify our savage cruelty.
In modern times it all started with the foo fighters in the last months of World War II, when no one knew what was going on, but now, nearly 80 yrs. later, almost everybody knows, but not the fools who keep ...
1) ... saying that only "silly" fools could believe that the Visitors are everywhere around us and have always been here,
2) ... repeating "ad infinitum" the naïve story about the Fermi Paradox, and
3) ... thinking that interstellar travel, let alone intergalactic travel, is impossible even with spacecraft that move at the speed of EM radiation (such as light, radio waves, gamma rays), except on trips involving several generations, so that a first generation dies during the trip and only a second or third generation arrives at the nearest star and will never be able to return.
(A trip to Proxima Centauri would take only 4.3 yrs. at that speed but a message would spend the same amount of time to arrive, so that dialogues with those at our nearest star would take decades, an outrageous affair.)
History shows that one had better not assume anything about the future based on present technology. Lord Kelvin is just one of the several famous scientists who made this mistake. I won't spare anyone the effort it takes to find out exactly what it was that he said that eventually made him look like ... just another dolt.
... and remember, we're an entire galaxy at war with itself, as in the "Star Wars" series, and it could be in your lot to run across the bad guys while rolling along a lonely road and get pregnant, as Mr. E. Castillo R. warned and even the NASA, incredibly, is now hinting. They mention "unexplained pregnancies" but refuse to give any details, which is criminally irresponsible of them. They, too, are terrified, since our nuclear weapons are entirely useless before the interlopers.
Some people say that the good guys have now placed the planet in quarantine in order to protect us, but I doubt it. Our inferior type of humankind, which enjoys the idea of enslaving and raping, surely deserves to be dragged into slavery, and it's one of several possible futures. ACHTUNG!!!