The governor is authorized and empowered to call members of the state guard to active state duty with the member's consent, for the performance of any official duty in connection with state guard activities. Inactive reserve status may include voluntary unpaid state service for assistance to local authorities during times of disaster, or other times of crisis, when requested from and approved by the adjutant general by city, county or metropolitan local authorities.
T.C.A. § 58-1-412