; 10 U.S.C. 2802 note) is amended— (1) in subsection (b)(1), by striking at least and all that follows through the period at the end and inserting , under the pilot program, at least— (A) one military construction project for mass timber; and (B) one military construction project for low carbon concrete. ; (2) in subsection (d), by striking September 30, 2024 and inserting September 30, 2025 ; (3) by redesignating subsections (e) and (f) as subsections (f) and (g), respectively; (4) by inserting after subsection (d) the following new subsection: (e) Deadline for commencement of construction Any construction pursuant to a military construction project carried out under the pilot program must commence by not later than January 1, 2025. ; and (5) in subsection (f)(1) (as so redesignated), by striking December 31, 2024 and inserting December 31, 2025 . 2872. Modification of pilot program on establishment of account for reimbursement for use of testing facilities at installations of the Department of the Air Force (a) In general Section 2862 of the Military Construction Authorization Act for Fiscal Year 2022 (division B of Public Law 117–81 ; 10 U.S.C. 9771 note prec.) is amended— (1) in subsection (a), by striking testing and inserting Major Range and Test Facility Base ; (2) in subsection (b), by inserting , have Major Range and Test Facility Base facilities, after construct