Going to be hard for the stock market to crash when the exchanges will all but shut down.
If the NG was operating on DS command, then the FBI wouldn't be trying to investigate their loyalties. Personally, I think General McInerney was spot on when he suggested Trump has already signed the Insurrection Act, in which case the NG is under the full authority of the President.
I should say "invoked" rather than "signed"
Secrecy? Same way they keep operations planning secret - compartmentalization through the chain of command.
Information given on a need-to-know basis.
Troops on the ground may not know they are there under such authority.
High-level commanders do, however.