1) Haven’t looked it up, but probably some executive order was signed that day that didn’t do anywhere near what’s claimed.
2) Oh, was that this last December 21st, or is this an old article? Because Mattis wasn’t having anything to do with Trump for over 2 years now. Left Secretary of Defense post on January 1, 2019. Resigning over Trumps insistence of withdrawing from Syria just because ISIS had been defeated for a total of about a day, basically.
3) Guantanamo Bay isn’t just a prison, it is an actual operating US naval base. Yeah, they need more than a dozen people there to actually run it.
4) And, that sure didn’t happen.