Adds new subsection (r) to 10 U.S.C. 9062 establishing definitions for terms used in the section, including advanced capability fighter aircraft, fifth-generation fighter aircraft, fighter aircraft, legacy capability fighter aircraft, next-generation air dominance fighter aircraft, and the term 'service retained'.

Amends subsection (i) of 10 U.S.C. 9062: modifies paragraph (1) text (inserting an exception reference, updates the effective date from October 1, 2026 to October 1, 2030, increases total aircraft and reserve component minimums from 1,800 to 1,900 and from 1,145 to 1,200 respectively), redesignates paragraph (2) as paragraph (3), inserts a new paragraph (2) authorizing the Secretary of Defense to temporarily reduce the inventory under specified conditions (minimum 1,800 aircraft at any time, maximum duration two years, and pre-authorization notification to congressional defense committees identifying units, with notification able to be provided via a fiscal-year quarterly report required by subsection (n)), and amends the redesignated paragraph (3) by striking specified text beginning with 'In this subsection:' and all that follows through the indicated point.