(a) Presumption of Service-Connection.—
For the purposes of section 1110 of this title, and subject to section 1113 of this title, a disease specified in subsection (b) that becomes manifest as specified in that subsection in a veteran described in paragraph (2) shall be considered to have been incurred or aggravated in the line of duty in the active military, naval, or air service, notwithstanding that there is no record of evidence of such disease during the period of such service.
(b) Diseases.—A disease specified in this subsection is—
a disease specified in paragraph (2) of subsection (a) of section 1116 of this title that becomes manifest as specified in that paragraph; or
(2) any additional disease that—
the Secretary determines in regulations warrants a presumption of service-connection by reason of having positive association with exposure to an herbicide agent; and
(c) Herbicide Agent.—