PERIODS OF PERFORMANCE FOR PUBLIC TRANSPORTATION SECURITY ASSISTANCE GRANTS.

SEC. 6421. PERIODS OF PERFORMANCE FOR PUBLIC TRANSPORTATION SECURITY ASSISTANCE GRANTS. Section 1406 of the Implementing Recommendations of the 9/11 Commission Act of 2007 (6 U.S.C. 1135; Public Law 110-53) is amended— (1) by redesignating subsection (m) as subsection (n); and (2) by inserting after subsection (l) the following new subsection: “(m) Periods of Performance.— “(1) In general.—Except as provided in paragraph (2), funds provided pursuant to a grant awarded under this section for a use specified in subsection (b) shall remain available for use by a grant recipient for a period of not fewer than 36 months. “(2) Exception.—Funds provided pursuant to a grant awarded under this section for a use specified in subparagraph (M) or (N) of subsection (b)(1) shall remain available for use by a grant recipient for a period of not fewer than 48 months.” .