Pub. L. 100–180, div. A, title VI, § 617(c), Dec. 4, 1987, 101 Stat. 1097, as amended by Pub. L. 112–81, div. A, title VI, § 631(f)(4)(B), Dec. 31, 2011, 125 Stat. 1465; Pub. L. 112–239, div. A, title X, § 1076(a)(9), Jan. 2, 2013, 126 Stat. 1948, provided that: “Subsection (h) of section 474 of title 37, United States Code (as added by subsection (a)), and section 1591 of title 10, United States Code (as added by subsection (b)), shall apply with respect to travel performed after the date of the enactment of this Act [Dec. 4, 1987].”