; vacancies (1) A member of the Commission shall be appointed for a term that may not exceed four years. (2) The Secretary shall ensure that terms of members of the Commission are staggered so that no such terms end on the same date. (3) A vacancy in the Commission shall be filled in the same manner as the original appointment, but the individual appointed to fill the vacancy shall serve only for the unexpired portion of the term for which the individual’s predecessor was appointed. (4) In appointing the initial members of the Commission, each official who is authorized to appoint two members of the Commission shall appoint— (A) one member whose term expires after two years; and (B) one member whose term expires after four years. (h) Pay (1) Members of the Commission shall serve without pay. (2) Each member of the Commission who is an officer or employee of the United States shall serve without compensation in addition to that received for service as an officer or employee of the United States. (3) Members shall receive travel expenses, including per diem in lieu of subsistence, in accordance with sections 5702 and 5703 of title 5. (i) Director of staff (1) The Commission shall appoint a Director who— (A) has not served as an employee of the Department during the one-year period preceding the date of such appointment