This bill amends the 2025 National Defense Authorization Act to exempt military installations that are undergoing a mission transition from Pentagon guidance that requires maintaining the total square footage of Department of Defense facilities. The exemption allows these specific installations to reduce or reconfigure their physical footprint without being required to offset those reductions elsewhere in the military's real estate portfolio. The legislation applies to installations experiencing mission transitions as of the bill's enactment date. No specific funding or timeline requirements are included in the bill itself, as it simply modifies existing guidance parameters rather than authorizing new spending.