37 U.S. Code § 908 - Employment of reserves and retired members by foreign governments
(a) Congressional Consent.—Subject to subsection (b), Congress consents to the following persons accepting civil employment (and compensation for that employment) for which the consent of Congress is required by the last paragraph of section 9 of article I of the Constitution, related to acceptance of emoluments, offices, or titles from a foreign government:
(1) Retired members of the uniformed services.
(2) Members of a reserve component of the armed forces.
(3) Members of the Commissioned Reserve Corps of the Public Health Service.
(b) Approval Required.—
A person described in subsection (a) may accept employment or compensation described in that subsection only if the Secretary concerned and the Secretary of State approve the employment.
(c) Military Service in Foreign Armed Forces.—
For a provision of law providing the consent of Congress to service in the military forces of certain foreign nations, see section 1060 of title 10.