IF any of this is true, and I mean the entire abduction scenario ... since I believe noone has 100% proof (I know 100% is really not possible ... before I get my leg bitten off ) that anything "abduct-y" is really going on ... maybe the aliens are much closer to us than we think? Which would mean of course that maybe they're not so alien since they would have a similar body chemistry and DNA to ours. Which ... means ... we may be straying into the area of Mac Tonnies' "Cryptoterrestrials" (??)I personally find that there are some odd fact patterns in this apparent phenomenon ...
And as for researchers going to the Pentagon etc, the only researcher I've heard similar rumours about is Bruce Maccabee who has given lectures from time to time to the CIA. But as some researchers have military and intelligence backgrounds its entirely possible that all of these ex-military/intelligence researchers are keeping tabs on the entire UFO subject regardless of whether UFOs or abductions really occur.
[I have no idea whether or not abduction researchers are briefing anyone at all since I've not even heard of a faint glimmer of a rumour of such things going on.]