; travel expenses Each member shall serve without pay but shall receive travel expenses to perform the duties of the Commission, including per diem in lieu of subsistence, at rates authorized under subchapter I of chapter 57 of title 5, United States Code. (b) Staff The Chair, in accordance with rules agreed upon by the Commission, may appoint and fix the compensation of a staff director and any other personnel that may be necessary to enable the Commission to carry out the functions of the Commission— (1) without regard to the provisions of title 5, United States Code, governing appointments in the competitive service