; 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) 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. .