For each challenge school:
1. The Office of the Military shall designate a person to draw all orders for the payment of money belonging to the challenge school. The orders must be listed on cumulative voucher sheets.
2. The Office of the Military shall prescribe the procedures by which the orders must be approved and the cumulative voucher sheets signed.
3. An action may not be maintained against the Office of the Military or against a challenge school to collect upon a bill not presented for payment to the Office of the Military within 6 months after the bill was incurred.