DC since it is not a state does not have a NG unit so they had to ask MD's governor to activate his Guard then Hogan needed permission from the DOD to send his units into DC. He did send the MD state police in immediately.
Hogan: Federal approval to send National Guard during Capitol attack delayed
The governor said he told the Congressional leaders he was “ready, willing and able” to send the National Guard to the Capitol. But because D.C. is not allowed to call up the Guard themselves, he needed approval from the Acting Secretary of Defense Christopher Miller to do so.
“We were repeatedly denied approval to do so,” Hogan said. “We had a little back-and-forth trying to get that authorization.”
About an hour and a half later, Army Secretary Ryan McCarthy called Hogan — who said he didn’t recognize the number on his phone but answered anyway — and gave them the authority.
New Year's Day--Now is the accepted time to make your regular annual good resolutions. Next week you can begin paving hell with them as usual. - Mark Twain