There is no cover up. There is nothing to cover up.
The so-called evidence is merest moonshine.
Documents or letters are not evidence of UFOs.
Radar recordings are of far too poor a quality to be useful.
Ed Komareck's blog is not evidence. The quoted paragraph is pure balderdash. Nobody was infiltrated. Nothing was disrupted. The World Weekly News is a pathetic scandal sheet for idiots, and always was, and will likely always be such.
What IS evidence is a piece of a UFO, or an intact UFO, or a crew member of a UFO. Nothing less is real evidence! Certainly NOT eyewitness testimony.
So far, no deal.