; and (2) is determined by the Secretary, in consultation with the Secretary of Defense, to have been exposed to a herbicide agent during such service in Thailand. (d) Herbicide agent For purposes of this section, the term herbicide agent means a chemical in a herbicide used in support of United States and allied military operations in Thailand, as determined by the Secretary in consultation with the Secretary of Defense, during the period beginning on January 9, 1962, and ending on May 7, 1975. . (b) Conforming amendment to definition of child Section 1831(1) of such title is amended— (1) in subparagraph (B)— (A) in the matter before clause (i), by striking subchapter III of this chapter and inserting section 1821 of this title ; and (B) in clause (i), by striking section 1821 of this title and inserting such section ; and (2) by adding at the end the following new subparagraph: (C) For purposes of section 1822 of this title, an individual, regardless of age or marital status, who— (i) is the natural child of a veteran of covered service in Thailand (as determined for purposes of such section); and (ii) was conceived after the date on which that veteran first entered service described in subsection (c) of such section. . (c) Clerical amendments (1) Subchapter heading The heading for subchapter III of chapter 18 of such title is amended by inserting and Thailand after Korea . (2) Table of sections The table of sections at the beginning of chapter 18 of such title is amended— (A) by striking the item relating to subchapter III and inserting the following new item: Subchapter III—Children of certain Korea and Thailand service veterans born with spina bifida ; and (B) by inserting after the item relating to section 1821 the following new item: 1822. Benefits for children of certain Thailand service veterans born with spina bifida. . (d) Effective date The amendments made by this section shall take effect on the date that is one year after the date of the enactment of this Act.