The board is hereby authorized to fix, revise, charge and collect rent for the use of armories or any part or parts thereof, and to contract with the Adjutant General of the state, with any other officer, department or public corporation or political subdivision thereof and with any person, partnership, association or corporation desiring the use thereof, and to fix the terms, conditions, rents and rates of charges for such use: Provided, however, That the primary purpose of armories shall be their use by the National Guard, and their use by other than the National Guard shall be subject to and shall not interfere with such primary purpose. Such rents shall be so fixed and adjusted in respect of the aggregate of rents from armories in connection with which the bonds of any issue shall have been issued as to provide a fund sufficient with other revenues, if any, to pay (a) the cost of maintaining, repairing and operating such armories and (b) the principal of and interest on such bonds as the same shall become due and payable, and to create reserves for such purposes. All rents and other revenues of the board received from the use of armories shall be paid into a special account of the treasurer of the State of West Virginia to be known as the general armory fund and shall be used solely for the purposes of this article. Such moneys shall be checked out and secured in the same manner as provided in section nine of this article.