I'm stuck between options 2 and 3. It all depends on the subjects itself, that is, the UFOs.
Number 2 is correct if UFOs are just that - UFOs. Maybe they did form a group, but they found out about just as much as the average person did. The
UFOs were, and still are, unidentified, and while they existed they looked closely on if these things could pose a threat. Now that such things never
happened, or at least, nothing serious happened, maybe they did wrap it all up.
Of course, this would be assuming the Roswell crash was a weather balloon, or something else, but not something not known to mankind. After all, take
away the claimed UFO crashes, and the only thing we have is people seeing UFOs and claiming to be abducted by something that seems to be aliens from
another planet. We really don't know.
Now, number 3 (and 4) could also be true, which would mean that this group is on to something not known to the general public.
My personal guess is that they went underground when Blue Book shut down in 1969. They're probably privately funded - which makes it much more easier
to them since they don't have anyone to answer to.
Second, I find it difficult to believe that such a group could survive in our modern bureaucracy given the politics and infighting that the
bureaucracy comes under these days.
This is why it would be much easier to keep it private than under governmental control. The question is if the "mission" of the organization is
important enough. If UFOs are the same mystery to them as it is to us, then it would be meaningless to continue having this group, under government
control or privately owned.
And what would be the role of such a group in the post-9/11 world?
If the group still exists, then 9-11 would only make their mission easier. Not only are governmental facilities even more protected than before, the
mere interest in government and governmental documents are more closely monitored. Their secret would be even more protected now than before. "Just
try taking a picture of FBI HQ", so to speak.