Minn. Stat. § 190.161: UNCOMPENSATED AND VOLUNTARY SERVICES; EXPENSES.

To assist in the discharge of the functions of the department, the adjutant general may accept uncompensated and voluntary services and enter into written agreements with private or public agencies or persons for uncompensated and voluntary services as may be practical. Persons rendering voluntary uncompensated services may be reimbursed for travel expenses incurred in the performance of official duties at the same rate per mile as state employees.