(a)
In general— Subsection (a) of section 1275 of the National Defense Authorization Act for Fiscal Year 2017 (Public Law 114–328; 130 Stat. 2540) is amended—
(1)
by striking “an annual basis” and inserting “a biannual basis”; and
(2)
by striking “the previous year” and inserting “the previous 6 months”.
(b)
Elements— Subsection (b) of such section is amended—
(1)
in the matter preceding paragraph (1), by striking “the year” and inserting “the period”;
(2)
in paragraph (1), by inserting “the number of maritime and overflight challenges to each such claim and” before “the country”;
(3)
in paragraph (5), by inserting “have been protested by the United States but” before “have not been challenged”; and
(4)
by adding at the end the following:
“(6) A summary of each excessive maritime claim challenged jointly with international partners and allies.”
(c)
Form— Subsection (c) of such section is amended by adding at the end before the period the following: “and made publicly available”.
(d)
Sunset— Subsection (d) of such section is amended by striking “December 31, 2021” and inserting “December 31, 2025” .
(e)
Conforming amendment— The heading of such section is amended by striking “annual” and inserting “biannual”.