; and (2) in each of fiscal years 2021 through 2026, not more than $150,000. (b) Purpose of reimbursement The amount authorized to be transferred under subsection (a) is to reimburse the Environmental Protection Agency for costs the Agency has incurred and will incur relating to the response actions performed at the Twin Cities Army Ammunition Plant, Minnesota, through September 30, 2025. (c) Interagency agreement The reimbursement described in subsection (b) is intended to satisfy certain terms of the interagency agreement entered into by the Department of the Army and the Environmental Protection Agency for the Twin Cities Army Ammunition Plant that took effect in December 1987 and that provided for the recovery of expenses by the Agency from the Department of the Army. 316. Prohibition on use of perfluoroalkyl substances and polyfluoroalkyl substances for land-based applications of firefighting foam (a) Limitation After October 1, 2022, no funds of the Department of Defense may be obligated or expended to procure firefighting foam that contains in excess of one part per billion of perfluoroalkyl substances and polyfluoroalkyl substances. (b) Prohibition on use and disposal of existing stocks Not later than October 1, 2023, the Secretary of Defense shall— (1) cease the use of firefighting foam containing in excess of one part per billion of perfluoroalkyl substances and polyfluoroalkyl substances