the powers of the Board and shall be filled in the manner in which the original appointment was made. (C) Reappointment A member of the Board may only be reappointed for 1 additional 2-year term. (6) Prohibition on compensation Except as provided in paragraph (7), members of the Board shall serve without pay. (7) Travel expenses Each member of the Board 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. (8) Meetings The Board shall meet as necessary to carry out its purpose and duties under this section, but shall meet in person not less frequently than on a quarterly basis. A majority of the members of the Board shall constitute a quorum. (d) Staff (1) Composition The Board shall be composed of full-time staff with requisite experience to assist the Board in carrying out its purpose and duties under this section in such number as the Director of National Intelligence determines appropriate. Such staff may be appointed by the Director of National Intelligence or detailed or otherwise assigned from another element of the intelligence community. (2) Security clearances Staff of the Board, shall, as a condition of appointment, detail, or assignment to the Board, as the case may be, hold appropriate security clearances for access to the classified records and materials to be reviewed by the staff, and shall follow the guidance and practices on security under applicable Executive orders and Presidential or agency directives. (e) Contract authority The Board may contract with and compensate government and private agencies or persons to enable the Board to carry out its purpose and duties under this section, without regard to section 6101 of title 41, United States Code. (f) Reports (1) Submission Beginning on the date that is 2 years after the date on which the Board is established, and once every 2 years thereafter until the date on which the Board terminates under subsection (i), the Board