I wonder what the rules of engagement are here. Anyway, it might be a good idea to swear in these Guardsman as (temporary) Deputy US Marshals. That would give them police powers and a bit of protection if things go south.
More National Guard Soldiers Head to D.C. and Prepare to Carry Weapons
Grok: on deputization of national guard (scroll down to second answer)
https://x.com/i/grok?conversation=1957265655507702250