as the head of the agency determines to be advisable and as is authorized by law. (2) Detail of employees Any Federal Government employee may be detailed to the Committee without reimbursement from the Committee, and such detailee shall retain the rights, status, and privileges of his or her regular employment without interruption. (j) Gifts The Committee may accept, use, and dispose of gifts or donations of services or property. (k) Postal services The Committee may use the United States mails in the same manner and under the same conditions as agencies. (l) Expert and consultant services The Committee is authorized to procure the services of experts and consultants in accordance with section 3109 of title 5, but at rates not to exceed the daily rate paid a person occupying a position at Level IV of the Executive Schedule under section 5315 of title 5. (m) Volunteer services Notwithstanding section 1342 of title 31, the Committee may accept and use voluntary and uncompensated services as the Committee determines necessary. (n) Reports (1) Interim reports The Committee may submit to the Administrator and Congress interim reports containing such findings, conclusions, and recommendations as have been agreed to by the Committee. (2) Annual reports Not later than 18 months after the date of the enactment of this section, and annually thereafter, the Committee shall submit to the Administrator and Congress a final report containing such findings, conclusions, and recommendations as have been agreed to by the Committee. (o) Sunset provision The authority and obligations established by this section shall terminate on the date that is five years after the date of the enactment of this section. 3616. Definitions (a) In general Except as provided under subsection (b), the definitions under sections 3502 and 3552 apply to sections 3607 through this section. (b) Additional definitions In sections 3607 through this section: (1) Administrator The term Administrator means the Administrator of General Services. (2)