; and (C) does not obligate the Federal Government to purchase strategic and critical materials from the reliable source. (b) Additional authorities (1) Extended contracting authority (A) In general The term of a contract or commitment made under subsection (a) may not exceed ten years. (B) Preexisting contracts A contract entered into before the date of the enactment of the National Defense Authorization Act for Fiscal Year 2024 for a term of more than ten years may be extended, on or after such date of enactment, for a total of not more than an additional ten years pursuant to any option or options set forth in the contract. (2) Matters relating to co-funding of bankable feasibility studies To the extent authorized by Congress pursuant to the Defense Production Act of 1950 ( 50 U.S.C. 4501 et seq. ) and determined to be required by the President pursuant to that Act, the National Defense Stockpile Manager may provide for loans or procure debt issued by other entities to carry out a project for the development of strategic and critical materials under subsection (a)(5). (c) Proposed transactions included in annual materials plan Descriptions of proposed transactions under subsection (a) shall be included in the Annual Materials and Operations Plan. Changes to any such transaction, or the addition of a transaction not included in such plan, shall be made in accordance with section 5. (d) Availability of funds The authority of the National Defense Stockpile Manager to enter into obligations under this section is effective for any fiscal year only to the extent that funds in the National Defense Stockpile Transaction Fund under section 9 are adequate to meet such obligations. (e) Bankable feasibility study defined In this section, the term bankable feasibility study means a comprehensive technical and economic study— (1) of the selected development option for a strategic and critical materials project that includes appropriately detailed assessments of realistically assumed extraction, processing, metallurgical,