of the Internal Revenue Code of 1986 is amended— (1) in subparagraph (A)— (A) by striking Not later than 6 years after the date of enactment of this section, the and inserting The , and (B) by inserting and every 6 months thereafter until all credits available under this section have been allowed after the date which is 6 years after the date of enactment of this section , (2) in subparagraph (B)— (A) by striking may reallocate credits available under clauses (i) and (ii) of paragraph (3)(B) and inserting shall reallocate credits remaining available under paragraph (3) , (B) by striking or at the end of clause (i), and (C) by striking clause (ii) and inserting the following: (ii) any applicant for certification which submitted an accepted application has subsequently failed to satisfy the requirements under paragraph (2)(D), or (iii) any certification made pursuant to paragraph (2) has been revoked pursuant to paragraph (2)(E). , and (3) in subparagraph (C)— (A) by striking clause (i) or (ii) of paragraph (3)(B) and inserting paragraph (3) , (B) by striking is authorized to and inserting shall , and (C) by striking an additional program and inserting additional programs . (f) Effective date (1) In general Except as provided in paragraph (2), the amendments made by this section shall apply to allocations and reallocations after the date of the enactment of this Act. (2) Reallocation The amendments made by subsection (e) shall apply to credits remaining available under section 48A(d)(3) of the Internal Revenue Code of 1986 on the date of the enactment of this Act.