Secret Space Programs likely do exist. There even was an article a while back about the air force secretary talking about potential declassifications.

This is all speculation, but I think the space force was created with the purpose of moving assets into the public space from the secret space programs. Sort of like a "look at all this new stuff we just made", when in reality it's existed and has been built up since like the mid 40s or something. Solar Warden was supposedly one of the earlier secret space programs. There's possibly/likely bases throughout the solar system, moon, mars, asteroids, moons of other planets, etc. As far as breakaway civilizations go, I've heard some vague stuff about the nazis/german occult societies creating a breakaway civilization, starting in/under Antarctica, moving into space shortly after. At this point they would be so advanced that we would see them as "aliens". Perhaps they're the ones with a lot of these "ufos"?

I've heard there's many different factions, the "Alliance" referring to the one that's trying to bring disclosure.

I cannot speak of the validity of all this information (as it's speculation only somewhat backed up by somewhat verifiable facts). However if you want more, you should research David Wilcock, disclosure related shows on gaia (cosmic disclosure being one). There's a lot of interesting info out there.

https://www.defensenews.com/smr/reagan-defense-forum/2019/12/08/barrett-rogers-plan-to-declassify-black-space-programs/