This bill, known as the "Fighter Force Preservation and Recapitalization Act of 2025," seeks to enhance the fighter aircraft capabilities of the Air Force and its reserve components. It amends title 10, United States Code, to extend the minimum fighter aircraft inventory requirement until October 1, 2030, and increases the total inventory to 1,900 aircraft, with 1,200 designated as primary mission aircraft. The legislation also permits temporary reductions in inventory for unit recapitalization, provided the total does not fall below 1,800 aircraft and congressional committees are notified. To ensure transparency and oversight, the bill mandates the Secretary of the Air Force to submit quarterly reports to congressional defense committees through September 30, 2030. These reports must detail the receipt and assignment of new advanced, fifth-generation, and next-generation fighter aircraft, including their distribution among the Regular Air Force, Air Force Reserve, and Air National Guard, as well as the retirement of legacy aircraft. Furthermore, it prioritizes the recapitalization of the active Air Force's service-retained fighter fleet, requiring that at least three out of every four new advanced aircraft be assigned to existing squadrons, allowing for a one-for-one retirement of legacy aircraft. For the Air National Guard , the bill requires the maintenance of at least 25 fighter squadrons until October 1, 2030, generally prohibiting the retirement or defunding of their assigned legacy or fifth-generation aircraft, with exceptions for non-mission capable planes. It also mandates an annual recapitalization plan for the Air National Guard fighter fleet, developed in consultation with the Director of the Air National Guard. This plan must outline a timetable for modernizing these squadrons at a rate similar to active components, assess budgetary and readiness impacts, and explore the acquisition of F-16 Block 70 aircraft for the Guard.