The amount received by the treasurer of a firefighters relief association from the state may be disbursed for the following purposes only:
1. For the maintenance of the association.
2. For pensions to and the relief of sick, injured, and disabled members of any fire department in the municipality, rural fire department, or the rural fire protection district and the members' surviving spouses and children.
3. For the payment of service pensions as provided in section 18-05-06 in the amounts and manner the association designates in its articles of incorporation and bylaws.