The US Military - Invoke the 1807 Insurrection Act
Generally Speaking The Army, Probably the Marines as well
How Is the National Guard Different from the U.S. Army?
The National Guard serves a dual role in the U.S. military by serving the community and its country. Most of the time, it's under the control of individual states, with the state governor acting as commander in chief. When this occurs, guard units are used to supplement the U.S. Army, bolstering its forces with additional combat units. The Guard responds to domestic emergencies, overseas combat missions, counterdrug efforts, reconstruction missions and more. However, the president can activate the National Guard and place it under federal control.
Soldiers in the National Guard train one weekend each month, with one two-week training period each year. They're typically called into action by a state governor, who can send them to the site of any officially declared emergency in the state. This is usually a weather-related emergency, but civil unrest or terrorist attacks are other emergencies they may respond to.