Meanwhile tank man had a shopping bag.
https://www.csg.org/2024/09/25/military-101-orders/
What section of US law they're activated/deployed under determines whether or not they can legally be used in an internal law enforcement capacity.
And generally speaking, federalized forces (either active or NG) cannot ever be used as law enforcement.
Hence why, despite the posturing and marketing of 'sending the military in', this administration is specifically using federalized military forces only in non-law enforcement capacities (and then encouraging the freed up state/local law enforcement to focus on law enforcement).
This is civil war. In a civil war there is no Uncle Sam. Just human beings from different states and of different political persuasions who need to decide what they do with their firepower, and whose orders they obey.
Deploying Guards would also be a good way to start building some institutional momentum for defending our country - preempting following illegal orders (like what happened in CA), sussing out traitors in the chain of command, and mitigating the dynamic where much of traditional state law enforcement is sympathetic to the destructionists.