this Act. (3) Applicability of certain civil service laws The Director and staff of the Commission shall be appointed without regard to the provisions of title 5, United States Code, governing appointments in the competitive service, and without regard to the provisions of chapter 51 and subchapter III of chapter 53 of such title relating to classification and General Schedules pay rates, except that no rate of pay fixed under this paragraph may exceed the equivalent of that payable for a position at level V of the Executive Schedule under section 5316 of title 5, United States Code. (4) Staff of Federal agencies Upon request of the Commission, the head of any Federal department or agency may detail, on a reimbursable basis, any of the personnel of that department or agency to the Commission to assist it in carrying out its duties under this Act. (f) Use of mails The Commission may use the United States mails in the same manner and under the same conditions as other departments and agencies of the United States. (g) Administrative support Upon the request of the Commission, the Administrator of General Services shall provide to the Commission, on a reimbursable basis, the administrative support services necessary for the Commission to carry out its responsibilities under this Act. (h) Powers of the Commission (1) Hearings and sessions The Commission may, for the purpose of carrying out this Act, hold hearings, sit and act at times and places, take testimony, and receive evidence as the Commission considers appropriate. (2) Subpoena power (A) In general The Commission may issue subpoenas requiring the attendance and testimony of witnesses and the production of any evidence relating to any matter under investigation by the Commission. The attendance of witnesses and the production of evidence may be required from any place within the United States at any designated place of hearing within the United States. (B) Failure to obey a subpoena If a person refuses to obey a subpoena issued under subparagraph (A), the