Calling in the marine guard without congress approval seems a little bit un-separate, but I'm not an expert so I'm not going to continue this conversation. You have an opinion and I have my very inexpert one too.

The Marines were rebased within the bounds of Constitutional and legal powers, as was the National Guard federalization and deployment.

Not agreeing with a thing doesn't make it illegal.

If Congress wants to prohibit Presidents from pushing these areas, then they're free to do so. (And expect they will once the clock tocks)