Subsection (d) of this section was derived from section 18j of Title 16, Conservation, which was amended by Pub. L. 113–235, div. F, title I, § 118, Dec. 16, 2014, 128 Stat. 2421. For applicability of that amendment to this section, see section 6(b) of Pub. L. 113–287, set out as a Transitional and Savings Provisions note preceding section 100101 of this title. Former section 18j of Title 16 was amended by striking “$3,500,000” and inserting “$5,000,000”.

In subsection (a), the words “chapter 51 and subchapter III of title 5” are substituted for “the civil service classification laws” for clarity and for consistency with other titles of the United States Code. The words “System units and related areas” are substituted for “areas administered by the Secretary through the National Park Service” for clarity and for consistency in the new title.

In subsection (b), the words “of volunteers” are added for clarity.

In subsection (c)(3), the words “relating to compensation to Federal employees for work injuries” are omitted as unnecessary.

In subsection (d), the words “such sums as may be necessary” are omitted as unnecessary.

2016—Subsec. (d). Pub. L. 114–289 substituted “not more than $9,000,000” for “not more than $7,000,000”. See Amendment Subject to Availability of Appropriations note below.

2015—Subsec. (d). Pub. L. 114–113 substituted “$7,000,000” for “$3,500,000”.

Pub. L. 114–289, title III, § 303, Dec. 16, 2016, 130 Stat. 1487, provided that the amendment of this section by section 303 is subject to the availability of appropriations.