But on the issue of UFOs, the DOD is comprised of many different factions, some of whom want disclosure, some who deny the issue exists, and some who are determined to hide the issue behind NDAs and stigmas (and worse).
Even within the various service branches, opinions differ re: UFOs.
The Air Force refuses to even discuss the matter and has refused access to their files to members of Congressional committees that have legal oversight powers. The Navy on the other hand has been increasingly forthcoming on the issue, admitting that there's something there that we can't identify and don't understand.
Even aside from the UFO issue the fact that the Navy and Air Force can have radically different policies on what is essentially the same topic is a clue that the formal organization chart of government is useless.
In theory any competent Chairman of the Joint Chiefs of Staff and President could fix this in five minutes.
In practice they are powerless.
But on issues like this there isn’t a debate.
Lets assume a scenario with BOTH 2)A and 2)B as you are proposing. (they are real and some parts of government want to release the info and some want to hide the info)
It would only take one entity who desired to hide it for it to be hidden. There is no prisoners dilemma or game theory to consider here.
If someone wants it hidden, they kill/imprison/silence the person attempting to leak it as they did to Assange/Snowden/Yeakey/Webb/Rich.