For the purpose of making surveys and investigations and obtaining information under this act, the adjutant general may compel by subpoena the attendance of witnesses, and the production of books, papers, records and documents of individuals, firms, associations and corporations; and all officers, boards, commissions and departments of the state, and the political subdivisions thereof, having information with respect thereto, shall cooperate with and assist him or her in making such investigations and surveys. In case of disobedience to a subpoena of the adjutant general, the adjutant general may invoke the aid of any court of competent jurisdiction in requiring the attendance and testimony of witnesses and the production of documentary evidence. Each witness who appears before the adjutant general by his or her order, other than a state officer or employee, shall receive for his or her attendance the fees and mileage provided for witnesses in civil actions in courts of record, which shall be audited and paid upon presentation of proper vouchers certified to by such witness and approved by the adjutant general.