The members of the Board shall not, by reason of such membership, be deemed officers or employees of the United States. Members of the Commission who are full-time officers or employees of the United States shall serve without additional compensation, but shall be reimbursed for travel, subsistence, and other necessary expenses incurred in the performance of the duties vested in the Board. Other members of the Board shall, while attending meetings of the Board or while engaged in duties related to such meetings or in other activities of the Commission pursuant to this title, be entitled to receive compensation at the rate not to exceed the daily equivalent of the rate authorized for GS–18 by
section 5332 of title 5, United States Code, including traveltime, and while away from their homes or regular places of business may be allowed travel expenses, including per diem in lieu of subsistence equal to that authorized by
section 5703 of title 5, United States Code, for persons in the Government service employed intermittently.