Advanced Acoustic Concepts LLC,* Happauge, New York (N66604-24-D-C401); Innovative Defense Technologies LLC*, Arlington, Virginia (N66604-24-D-C403); L3 Technologies Inc., Millersville, Maryland (N66604-24-D-C405); Leidos Inc., Reston, Virginia (N66604-24-D-C406); DRS Naval Power Systems Inc., Menomonee Falls, Wisconsin (N66604-24-D-C407); Lockheed Martin Corp., Liverpool, NY (N66604-24-D-C408); McLaughlin Research Corp.,* New London, Connecticut (N66604-24-D-C409); Mike Inc.,* Middletown, Rhode Island (N66604-24-D-C410); Progeny Systems LLC, Manassas, Virginia (N66604-24-D-C412); QorTek Inc.,* Linden, Pennsylvania (N66604-24-D-C413); Raytheon BBN Technologies Corp., Cambridge, Massachusetts (N66604-24-D-C414); Research and Development Solutions Inc.,* McLean, Virginia (N66604-24-D-C415); Serco Inc., Herndon, Virginia (N66604-24-D-C418); Sonalysts Inc.,* Waterford, Connecticut (N66604-24-D-C419), and Sparton DeLeon Springs LLC, DeLeon Springs, Florida (N66604-24-D-C420), are each awarded $2,500, toward a combined $245,932,500 indefinite-delivery/indefinite-quantity, multiple award contract, for Undersea Weapons Undersea Defensive Family of Systems development efforts, with firm-fixed-price, cost-plus-fixed-fee, and cost-only provisions for supplies and services to support research, development, and test and evaluation efforts for undersea weapons, and undersea defensive technologies. Services include design, development, fabrication, testing, installation, documentation, production, and delivery of rapid prototype material solutions and services. Work will be performed at Naval Undersea Warfare Center Division, Newport, Rhode Island (70%); Naval Undersea Warfare Center Division, Keyport, Washington, and other government locations (30%). Work is expected to complete January 2029. Fiscal 2023 weapons procurement (Navy) funding in the amount of $37,500 will be obligated at the time of award and will not expire at the end of the current fiscal year. All other funding will be made available at the delivery and task order level as contracting actions occur. The contract was competitively procured via the System for Award Management website with 15 acceptable offers received. The Naval Undersea Warfare Center Division, Newport, Rhode Island, is the contracting activity.