; and (D) Camp Navajo, Arizona. 3. Multiyear procurement authority for LGM–35A Sentinel intercontinental ballistic missiles (a) Authority for multiyear procurement (1) In general Subject to the provisions of section 3501 of title 10, United States Code, described in paragraph (3), the Secretary of the Air Force may enter into one or more multiyear contracts for the procurement of not more than 659 LGM–35A Sentinel intercontinental ballistic missiles. (2) Procurement in conjunction with existing contracts The missiles authorized to be procured under paragraph (1) may be procured as additions to existing contracts covering the Sentinel intercontinental ballistic missile weapon system program. (3) Provisions described The provisions of section 3501 of title 10, United States Code, described in this paragraph are the following: (A) Subsection (a)(1). (B) Subsection (f). (C) Subsection (g), in which the term contract described in subsection (a) shall mean a contract awarded pursuant to the authority provided by this subsection. (D) Subsection (i)(1). (E) Subsection (l)(3). (b) Authority for advance procurement The Secretary of the Air Force may enter into one or more contracts, beginning in fiscal year 2024, for advance procurement associated with the missiles for which authorization to enter into a multiyear procurement contract is provided under subsection (a), and for subsystems associated with such missiles in economic order quantities when cost savings are achievable. (c) Condition for out-Year contract payments A contract entered into under subsection (a) shall provide that any obligation of the United States to make a payment under the contract for a fiscal year after fiscal year 2024 is subject to the availability of appropriations or funds for that purpose for such later fiscal year. (d) Mandatory inclusion of pre-Priced option in certain circumstances (1) In general If the total base quantity of LGM–35A Sentinel intercontinental ballistic missiles to be procured through all contracts is less than 659, the