Any two or more member states may designate the Northeastern Forest Fire Protection Commission as a joint agency to maintain such common services as those states deem desirable for the prevention and control of forest fires. Except in those cases where all member states join in such designation for common services, the representatives of any group of such designating states in the Northeastern Forest Fire Protection Commission shall constitute a separate section of such commission for the performance of the common service or services so designated provided that, if any additional expense is involved, the states so acting shall appropriate the necessary funds for this purpose. The creation of such a section as a joint agency shall not affect the privileges, powers, responsibilities or duties of the states participating therein as embodied in the other articles of this compact.