The Department of Defense, through the Naval Facilities Engineering Command Southeast, is soliciting proposals for a firm-fixed-price construction contract for the P620 Engine Test Cell Facility at Naval Air Station (NAS) Jacksonville, Florida. This project involves the design and construction of a facility that is critical for supporting naval aviation operations and ensuring the readiness of aircraft engines. The proposal submission deadline has been extended to November 21, 2025, at 3:00 PM (ET), and all proposals must acknowledge this amendment to avoid rejection. For further inquiries, interested parties may contact Cynthia McMonigle at cynthia.a.mcmonigle.civ@us.navy.mil or Lindsay Betteridge at lindsay.e.betteridge.civ@us.navy.mil.