The Naval Undersea Warfare Center Division, Newport, RI (NUWCDIVNPT) requires a five-year indefinite delivery/indefinite quantity production contract for DT-511C and DT-592D hydrophones and spare parts to replenish and maintain fleet inventory. The contractor must design, document, manufacture, test, package, and deliver up to three first article hydrophones of each model and up to 300 production hydrophones meeting the applicable Critical Item Performance Specifications, plus up to 100 each of build-to-print spare parts per the reference drawings. This unrestricted acquisition uses NAICS 334511, with an anticipated RFP release in September 2026 and expected evaluation factors of technical capability, past performance, small business participation, and price. Applicable documents are Distribution D export-controlled and require DoD Joint Certification Program registration, current CMMC certification at the specified level, and a NIST 800-171 DoD Assessment not more than three years old; access is requested through the POC and DoD SAFE, and the document link expires seven days after it is sent.