16 U.S. Code § 972a - United States representation on the Council
(a) Appointment by Secretary of State
The Secretary of State—
An individual is not eligible for appointment as, or to serve as, the United States representative under subsection (a)(1) of this section unless the individual is an officer or employee of the United States Government.
An individual is not entitled to compensation for serving as the United States representative or an alternate United States representative.
(d) Travel expenses
While away from home or a regular place of business in the performance of service as the United States representative or an alternate United States representative, an individual is entitled to travel expenses, including per diem in lieu of subsistence, in the same manner as individuals employed intermittently in Government service are allowed expenses under section 5703 (b)  of title 5.
 See References in Text note below.