This bill, known as the Air National Guard Squadron Preservation Act of 2025, establishes a policy for the United States to maintain the strength and capabilities of its Total Fighter Force by fully recapitalizing Air National Guard fighter squadrons. It specifically requires the Secretary of the Air Force to take necessary steps to ensure the continued production and procurement of at least one model of advanced capability fighter aircraft and one model of fifth generation fighter aircraft . This mandate remains in effect until the Secretary certifies to congressional defense committees that all legacy capability fighter aircraft within covered Air National Guard fighter units have been replaced with advanced or fifth-generation aircraft. To achieve this, the Secretary is authorized to enter into new contracts or modify existing ones for the procurement of these modern fighter jets. The bill also directs the Comptroller General of the United States to conduct a review of advanced capability fighter aircraft, assessing procurement challenges and offering recommendations for solutions. A briefing on preliminary findings is due within one year, followed by a final report to the congressional defense committees. Subsequently, the Secretary must submit annual reports detailing progress in implementing these recommendations and replacing legacy aircraft. Furthermore, the Secretary, in consultation with the Director of the Air National Guard, must conduct a feasibility study on the need for procuring advanced capability fighter aircraft for both active and reserve components. This study will consider factors such as unmanned capabilities, potential cost savings from F-16 sales, eligible units for recapitalization, and the effectiveness of multiyear contracts. The findings of this study are to be reported to the congressional defense committees within 180 days of the bill's enactment.