Subsection (a) is revised to (1) add paragraph numbering, (2) replace the phrase 'any provision of title 18' with the specific 'sections 32, 1030, and 1367 and chapters 119 and 206 of title 18', and (3) add a new paragraph (2) delegating the authority to take actions described in subsection (b)(1) to combatant commanders, the Secretary concerned, or other DoD officials the Secretary of Defense considers appropriate.

Modifies subsection (b)(1)(B) by inserting text before the final period (effectively changing the terminal punctuation).

Revises subparagraph (B) punctuation, redesignates existing subparagraph (C) as (D), and inserts a new subparagraph (C) stating activities 'would support another Federal agency with authority to mitigate the threat of unmanned aircraft systems or unmanned aircraft in mitigating such threats.'

Redesignates subsections (g),(h),(i),(j) as (h),(j),(k),(l), respectively (structural redesignation).

Adds new subsection (g) providing an exemption from disclosure for information pertaining to the technology, procedures, and protocols used to carry out this section, including regulations or guidance, exempting such information from disclosure under 5 U.S.C. 552(b)(3) and any State or local law requiring disclosure.

Adds a new subsection (i) stating that specified sections and chapters of title 18 (sections 32, 1030, and 1367 and chapters 119 and 206) and section 46502 of title 49 may not be construed to apply to Department of Defense or Coast Guard activities that are conducted outside the United States and are related to mitigation of threats from unmanned aircraft systems or unmanned aircraft.

In the subsection redesignated as (k), updates internal subsection references and extends deadlines/dates: changes a cross-reference from subsection (j)(3)(C) to subsection (l)(3)(C) and updates a date from December 31, 2026 to December 31, 2030. Also, in paragraph (2) replaces '180 days' with 'one year' and updates a date from November 15, 2026 to November 15, 2030.

In the subsection redesignated as (l), adjusts punctuation in paragraph (1) subparagraphs (B) and (C), redesignates paragraphs (3)-(6) as (4)-(7), inserts a new paragraph (3) defining 'combatant command' by reference to section 161 of title 10, and in the redesignated paragraph (4) adds new clauses (x)–(xiii) covering protection of certain DoD property, assistance to Federal/State/local officials for incidents involving NBC weapons or high-yield explosives (including under section 282 and the Stafford Act), activities permitted by section 2692(b), and emergency response limited to a specified timeframe and location.

Adds a new section 4821 to Title 10, establishing requirements for agency heads to maximize competition in space acquisitions and to develop acquisition and contracting guidance to prevent major reduction or consolidation of the space industrial base.