The Insurance Claims Sections are vested with exclusive jurisdiction in determining the liability of the United States and the United States Government Life Insurance Fund for waiver of payment of premiums, payment of total, total permanent disability, and death insurance benefits under United States Government life insurance and to determine the liability of the United States and the National Service Life Insurance Fund for waiver of payment of premiums due to total disability, payment of total disability insurance benefits, and death insurance benefits under National Service life insurance.