Pub. L. 109-234, tit. I, ch. 6, sec. 1603 (as amended)

SEC. 1603. (a) In General.—(1) During fiscal years 2006 (including the period beginning on October 1, 2005, and ending on June 15, 2006), 2007, and 2008, the head of an agency may, in the agency head’s discretion, provide to an individual employed by, or assigned or detailed to, such agency allowances, benefits, and gratuities comparable to those provided by the Secretary of State to members of the Foreign Service under section 413 and chapter 9 of title I of the Foreign Service Act of 1980 (22 U.S.C. 3973; 4081 et seq.), if such individual is on official duty in Iraq or Afghanistan. (2) During fiscal years 2009 through 2027, the head of an agency may, in the agency head’s discretion, provide to an individual employed by, or assigned or detailed to, such agency allowances, benefits, and gratuities comparable to those provided by the Secretary of State to members of the Foreign Service under section 413 and chapter 9 of title I of the Foreign Service Act of 1980, if such individual is on official duty in Pakistan or a combat zone (as defined by section 112(c) of the Internal Revenue Code of 1986). (b) Construction.—Nothing in this section shall be construed to impair or otherwise affect the authority of the head of an agency under any other provision of law. (c) Applicability of Certain Authorities.—Section 912(a) of the Internal Revenue Code of 1986 shall apply with respect to amounts received as allowances or otherwise under this section in the same manner as section 912 of the Internal Revenue Code of 1986 applies with respect to amounts received by members of the Foreign Service as allowances or otherwise under chapter 9 of title I of the Foreign Service Act of 1980.