You might also take this as an implicit shot across the bow of the Xiden Administration as the US convoy is mobilizing as I type this. Don’t expect them to cheer if you order the Guard to fire on truckers, Joey...
Or they maybe an honest leftist who forgot to read the latest memo.
I have a feeling that americans, coming from American culture, will be a little more quick to use their guns if the police get to dramatic. Just think about the Bundy ranch standoff.
The Guard won't be called up. UN mercenary forces will. They won't be wearing blue helmets either. They'll look just like Guardsmen or police, but they will have no identifying insignia. In wartime they would be treated as spies and shot on sight.