Expands how the Department of Defense and state, local, and tribal governments can use intergovernmental support agreements for installation services, and allows DoD to partner with other Federal agencies in those agreements. It extends the current authority from 2025 to 2030 and creates a pilot program allowing the Secretary of Defense to enter one long‑term intergovernmental agreement (up to 20 years) for each of the Army, Navy, and Air Force. Some specific replacement text referenced in the amendment is not included in the provided excerpt.