In addition to the assistance set forth in subparagraphs (A) and (B), other departments and agencies of the United States may provide the Commission such services, funds, facilities, staff, and other support as such departments and agencies consider advisable and as may be authorized by law. (D) Cooperation The Commission shall receive the full and timely cooperation of any official, department, or agency of the Federal Government whose assistance is necessary, as jointly determined by the co-chairs selected under subsection (b)(2), for the fulfillment of the duties of the Commission, including the provision of full and current briefings and analyses. (4) Postal services The Commission may use the United States postal services in the same manner and under the same conditions as the departments and agencies of the Federal Governments. (5) Gifts No member or staff of the Commission may receive a gift or benefit by reason of the service of such member or staff to the Commission. (g) Staff of Commission (1) Appointment and compensation of staff The co-chairs of the Commission, in accordance with rules agreed upon by the Commission, shall appoint and fix the compensation of a staff director and such other personnel as may be necessary to enable the Commission to carry out its duties, 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 Schedule pay rates, except that no rate of pay fixed under this subsection may exceed the equivalent of that payable to a person occupying a position at level V of the Executive Schedule under section 5316 of such title. (2) Detail of Government employees Any Federal Government employee may be detailed to the Commission without reimbursement from the Commission, and such detailee shall retain the rights, status, and privileges of his or her regular employment without interruption. (3)