((a)) The Director of the Office of Defense Mobilization, the Director of National Intelligence, and the National Security Council, acting through its Executive Secretary, are authorized to appoint such advisory committees and to employ, consistent with other provisions of this chapter, such part-time advisory personnel as they may deem necessary in carrying out their respective functions and the functions of agencies under their control. Persons holding other offices or positions under the United States for which they receive compensation, while serving as members of such committees, shall receive no additional compensation for such service. Retired members of the uniformed services employed by the Director of National Intelligence who hold no other office or position under the United States for which they receive compensation, other members of such committees and other part-time advisory personnel so employed may serve without compensation or may receive compensation at a daily rate not to exceed the daily equivalent of the rate of pay in effect for grade GS–18 of the General Schedule established by , as determined by the appointing authority.
((b)) Service of an individual as a member of any such advisory committee, or in any other part-time capacity for a department or agency hereunder, shall not be considered as service bringing such individual within the provisions of section 203, 205, or 207 of title 18, unless the act of such individual, which by such section is made unlawful when performed by an individual referred to in such section, is with respect to any particular matter which directly involves a department or agency which such person is advising or in which such department or agency is directly interested.