Members of the Council or of any advisory committee appointed under this section who are not regular full-time employees of the United States shall, while serving on business of the Council or any such committee, be entitled to receive compensation at rates fixed by the Secretary, but not exceeding $75 per day, including travel time; and while so serving away from their homes or regular places of business, they may be allowed travel expenses, including per diem in lieu of subsistence, as authorized by section
5703 of title
5 for persons in Government service employed intermittently.