I am a bit mystified at your apparent belief that the military has any obligation to proactively tell anybody anything, or find it shocking that a military would ever hide things from anybody, to the point that you would attack people claiming that they might do so.
Are you aware that there is, in fact, a such thing as "classified" information? If you'll pardon me linking to that hotbed of conspiratorial thinking, the Cornell Law School, here's some of the basic, completely open, law covering such things: https://www.law.cornell.edu/uscode/text/18/798
Where on Earth do you get the idea that everyone in the world is operating in a regime where they tell you everything you want to know simply because you want to know it?
You are operating at personally dangerous levels of naivety, like, levels that are going to cost you money when you fall for a big scam because you thought someone was just informing you of a great money-making opportunity, as everyone always does when they find a way to make money. Or worse. You're light years beyond "rejecting conspiracy theories", you're operating on a Theory of Mind that has no visible correspondence to the real world. This is not how the world works. People and organizations do not rush to reveal everything they are, everything they can do, everything they know, to everybody, all the time, for free, simply because it would be really nice, and the military least of all!