In subsec. (a), “chapter 51 and subchapter III of chapter 53 of title 5” substituted for “the Classification Act of 1949, as amended” on authority of Pub. L. 89–554, § 7(b), Sept. 6, 1966, 80 Stat. 631, the first section of which enacted Title 5, Government Organization and Employees.

In subsec. (b), “section 6101 of title 41” substituted for “section 3709, Revised Statutes (41 U.S.C., sec. 5)” on authority of Pub. L. 111–350, § 6(c), Jan. 4, 2011, 124 Stat. 3854, which Act enacted Title 41, Public Contracts.