The main assumption that has been made is that the government has something to disclose. There is always the possibility that they do not have any extraterrestrial bodies or craft in their possession. I am one to think they do have a limited amount of extraterrestrial items in their inventory, and the many government documents that have turned up seem to suggest this.
I also do not think the government or any of its agencies have any control over who gets abducted or why. I know there is a big part of the UFO community that believes there are places such as Dulce that have humans and aliens working together, but there is not one shred of evidence to support those theories. It is too scary for most people who have been abducted to realize they and the government are powerless to do anything about what is happening.
As I also have stated before, government bureaucracies love to hang on to secrets and are not willing to share with others. It sounds childish, but it is unfortunately true. I do not see any alphabet agency willing to give up any extraterrestrial items anytime soon. Don't look for the POTUS to help in the situation, as he may not have a need to know. President Eisenhower was very smart when he started many agencies while president. He purposely made need to know a top priority, and even made it difficult for most presidents to have all the secrets out there. Author and researcher James Bamford has written a few books about the NSA and its history that suggest these theories. There are documents he shows to back up some of these theories posted here.
Basically, if a presidential candidate states they are for full disclosure, they may not get the real information. President Bush (I) probably did, as he was a former CIA director.
A short answer to your query, no the government does not have any real plans for monitoring abductees or contactees. They probably don't know who is really being abducted and those who are having other experiences.