Looking at the following quotes it is evident that the world of UFO secrecy has developed many cracks over the years.
Colonel John Alexander is the author of “UFOs: Myths, Conspiracies, and Realities.” Alexander is on the record stating that he talked to the Director or Deputy of all the lettered intelligence agencies and that none of them had any knowledge of a government interest in UFOs or a cover-up of information. However, speaking on MJ-12, the long rumored control group that oversees UFO secrecy, research, and policy Alexander said something much different,
I had someone whisper to me that it had existed. I didn’t think it had existed at all, but when I looked into it and asked if the names were correct, and they said yes and that should tell me what I need to know to figure it out.
President Ronald Reagan speaks after the screening at the White House of the movie ET-The Extraterrestrial on June 27, 1982,
'I wanted to thank you (Spielberg) for bringing E.T. to the White House. We really enjoyed your movie, and there are a number of people in this room who know that everything on that screen is absolutely true.'
The CIA after 30+ years of denials now confirms the existence of Area-51 where it has long been rumored that flying saucers were back-engineered (even though it was actually S4 - 15 miles south west). From a just declassified CIA document,
"AEC chairman Adm. Lewis Strauss readily agreed and President Eisenhower also approved the addition of this strip of wasteland, known by its map designation as Area 51, to the Nevada Test site,"