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.