Two points, please:
1. As President of the Senate, Pence has the right to ask for National Guard help. But he has no right to “demand” it.
2. There are all sorts of police agencies in DC (the DC police, the Capitol police, the US Marshals, etc.). I find it troubling that the Deep Staters called on a military force - the National Guard - so quickly.
I suspect the National Guard takes hours to mobilize.
Calls might have been placed to Fort Myers, the Pentagon, Quantico, that might have provided help within an hour.
Of course, Pence could have simply spoken to the crowd and explained his position.
There’s also the Marine Barracks that is eight blocks from the Capitol.
Marines could have been at the Capitol in ten minutes.