16 U.S. Code § 3640 - Administrative matters
Travel and other necessary expenses shall be paid for all United States Commissioners, Alternate Commissioners, Panel Members, Alternate Panel Members, members of the Joint Technical Committee, and members of the Advisory Committee when engaged in the actual performance of duties for the United States Section or for the Commission.
Except for officials of the United States Government, such individuals shall not be considered to be Federal employees while engaged in the actual performance of duties for the United States Section or for the Commission, except for the purposes of injury compensation or tort claims liability as provided in chapter 81 of title 5 and chapter 71  of title 28.
 So in original. Probably should be chapter “171”.
References in laws to the rates of pay for GS–16, 17, or 18, or to maximum rates of pay under the General Schedule, to be considered references to rates payable under specified sections of Title 5, Government Organization and Employees, see section 529 [title I, § 101(c)(1)] of Pub. L. 101–509, set out in a note under section 5376 of Title 5.
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