year. A vacancy in the membership of the Task Force shall be filled in the same manner as the original appointment. (4) No compensation for service Members of the Task Force shall serve without pay, but shall receive travel expenses, including per diem in lieu of subsistence, in accordance with applicable provisions under subchapter I of chapter 57 of title 5, United States Code. (d) Bi-Annual report to Congress Not later than March 1 of each odd-numbered year, the Attorney General shall submit a report to Congress on the operation of the telephone service established under this section during the previous 2 years, and shall include in the report— (1) an enumeration of the number and type of calls that were received by the service