A National Guard drill based around dealing with civil unrest after a dirty bomb attack in California featured role players acting as angry Americans yelling 'right-wing' rhetoric.

The exercise, which Infowars reporters were barred from attending, took place in Richmond this past weekend and involved more than 200 soldiers, airmen, local law enforcement and firefighting personnel.

Footage captured by a local shows Guard troops pushing irate citizens away with batons before one of the protest group states, "I'm a sovereign citizen, I refuse to recognize you guys, I refuse to recognize you."

"Why in the course of a drill for a dirty bomb, would an actor claim to be a sovereign citizen?" asks Keith Johnson, who filmed the footage. "The San Francisco Bay Area is not known for it's sovereign citizen militia population and hearing this shouted during a mock terrorist scenario was disturbing. Anybody familiar with Richmond will tell you it is not a rural 'militia' environment. Located in the East Bay Area near Oakland, it is a community with reduced circumstances. No one there is going to be proclaiming to be a sovereign citizen."