The Massachusetts State Defense Force (MSDF) was a state defense force of the Commonwealth of Massachusetts. It was inactivated in 2016 by Governor Charlie Baker. The purpose of the Massachusetts State Defense Force was to augment the Massachusetts National Guard during emergencies in the state, especially when some or all of the National Guard was deployed. The MSDF was an all-volunteer militia which reported to the State Adjutant General and was under the command of the Governor of Massachusetts. Members met for drills one weekend per month unless activated by the Governor during an emergency. The MSDF was headquartered at Milford, Massachusetts, in the same building as the Massachusetts National Guard. The director of the MSDF was appointed by The Adjutant General of Massachusetts (TAGM