for a position at level IV of the Executive Schedule under section 5315 of title 5, United States Code, for each day during which that member is engaged in the actual performance of the duties of the Commission. (b) Travel expenses While away from their homes or regular places of business in the performance of services for the Commission, members of the Commission shall be allowed travel expenses, including per diem in lieu of subsistence, in the same manner as persons employed intermittently in the Government service are allowed expenses under section 5703(b) of title 5, United States Code. 11. Security clearances for Commission members and staff The appropriate Federal agencies or departments shall cooperate with the Commission in expeditiously providing to the Commission members and staff appropriate security clearances to the extent possible pursuant to existing procedures and requirements, except that no person shall be provided with access to classified information under this title without the appropriate security clearances. 12. Reports of Commission