The President shall appoint to the Commission a United States Commissioner who shall serve at the pleasure of the President. The President may appoint one Native from each of the two inhabited Pribilof Islands to serve as Advisors to the Commissioner and as liaisons between the Commissioner and the Natives of the Pribilof Islands. The President may also appoint other interested parties as Advisors to the Commissioner. Such Advisors shall serve at the pleasure of the President. The President may also appoint a Deputy United States Commissioner who shall serve at the pleasure of the President. The Deputy Commissioner shall be the principal adviser of the Commissioner, and shall perform the duties of the Commissioner in the case of his death, resignation, absence, or illness. The Commissioner, the Deputy Commissioner, and the Advisors shall receive no compensation for their services. The Commissioners may be paid traval ¹ expenses and per diem in lieu of subsistence at the rates authorized by section 5703 of title 5 when engaged in the performance of their duties.