National Guard, in Garrison, would mean military force, police force, paramilitary force, etc. The primary duty of a National Guard is to guard the nation. The governor of state can activate National Guard troops during emergencies or disaster situations, like hurricanes or terrorist attacks.
The troops in Garrison respond to emergencies, and go for fighting missions as well as reconstruction missions which require immense speed, energy and efficiency. National Guard troops in Garrison should always be ready to face any crisis situation and handle it expertly .