SEC. 2. ALLOWABLE USES OF FUNDS FOR PUBLIC TRANS-
PORTATION SECURITY ASSISTANCE GRANTS. 
Subparagraph (A) of section 1406(b)(2) of the Imple-
menting Recommendations of the 9/11 Commission Act of 
2007 (6 U.S.C. 1135(b)(2); Public Law 110–53) is 
amended by inserting ‘‘and associated backfill’’ after ‘‘se-
curity training’’. 
SEC. 3. PERIODS OF PERFORMANCE FOR PUBLIC TRANS-
PORTATION SECURITY ASSISTANCE GRANTS. 
Section 1406 of the Implementing Recommendations 
of the 9/11 Commission Act of 2007 (6 U.S.C. 1135; Pub-
lic Law 110–53) is amended— 
(1) by redesignating subsection (m) as sub-
section (n); and 
(2) by inserting after subsection (l) the fol-
lowing new subsection: 
‘‘(m) PERIODS OF PERFORMANCE.— 
‘‘(1) IN GENERAL.—Except as provided in para-
graph (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 speci-
fied in subparagraph (M) or (N) of subsection (b)(1) 
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shall remain available for use by a grant recipient 
for a period of not fewer than 55 months.’’. 
SEC. 4. GAO REVIEW. 
(a) IN GENERAL.—The Comptroller General of the 
United States shall conduct a review of the transit security 
grant program under section 1406 of the Implementing 
Recommendations of the 9/11 Commission Act of 2007 (6 
U.S.C. 1135; Public Law 110–53). 
(b) SCOPE.—The review required under paragraph 
(1) shall include the following: 
(1) An assessment of the type of projects fund-
ed under the transit security grant program referred 
to in such paragraph. 
(2) An assessment of the manner in which such 
projects address threats to transportation infrastruc-
ture. 
(3) An assessment of the impact, if any, of this 
Act (including the amendments made by this Act) on 
types of projects funded under the transit security 
grant program. 
(4) An assessment of the management and ad-
ministration of transit security grant program funds 
by grantees. 
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(5) Recommendations to improve the manner in 
which transit security grant program funds address 
vulnerabilities in transportation infrastructure. 
(6) Recommendations to improve the manage-
ment and administration of the transit security 
grant program. 
(c) REPORT.—Not later than one year after the date 
of the enactment of this Act and again not later than five 
years after such date of enactment, the Comptroller Gen-
eral shall submit to the Committee on Homeland Security 
of the House of Representatives and the Committee on 
Homeland Security and Governmental Affairs of the Sen-
ate a report on the review required under this section. 
Æ 
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