The Presidents and the Hard Evidence (interview with Grant Cameron)
There were a number of attempts. "Close Encounters" was one, "Project UFO" a TV series was another, produced by Colonel Coleman from Blue Book, that ran for two years. This was rumoured to be one of the schemes to drag the truth out without disclosing the cover up. Walt Disney was offered footage in 1956 and it was pulled back at the last moment. Mike Malloney, a British photo journalist talks about going to Disney and being shown some footage in 1972 by a guy called Kimball.
In 1980 Linda Howe was offered the Holloman film. She was working on a documentary for HBO at the time. She was contacted by Richard Dowey [sic] and people in the DIA and she was made the same offer. The Holloman clip was to go into the HBO documentary and they dragged it out and dragged it out. She didn't get the footage and in the end, they tried to get her to go to PBS as they felt they could control the Public Broadcasting better than they could HBO.
I think covert government agencies are interested in the UFO phenomenon for two main reasons. The first is data collection. With a bizarre, potentially nonhuman spectacle unfolding in our skies, it's logical to enlist the efforts of private researchers, even if their perceptions have been muddied by disinformation and the distortions of belief.
Secondly, it makes sense to keep the public in "standby" mode in the event of an unexpected breakthrough -- which may not have anything at all to do with extraterrestrials. UFOs, while real enough, make wonderful scapegoats for "black ops" aerospace projects because our culture is impregnated with filmic visions of alien contact.
Whether movies like "Close Encounters of the Third Kind" play a semi-official indoctrination role, as argued by Cameron, is an entirely secondary issue and, in my opinion, camouflages the central dilemma by fostering a false sense of imminent disclosure. For if we are indeed being visited by humanoid aliens with comprehensible motives (itself a dubious proposition), I can't help but think that revelations of any meaningful sort will only be forthcoming from "them."