Unfortunately, I think there is.
I haven’t seen a bottom to this pit, yet.
I think you're right. Too bad nobody has really been able to penetrate, especially, that trackless swamp known as the VietNam MIA/POW issue. There are enough open questions attached to that one to keep even you busy researching and documenting for the next 2 years. I understand that McCain had something to do with the fact that most of the DoD data that would have been declassified by now is in fact still classified and, of that actually released, it has been redacted to shreds.