This is a $74,865 firm-fixed-price purchase order awarded by the Defense Contract Management Agency to General Dynamics Mission Systems, Inc. (GDMS), a subsidiary of General Dynamics Corporation. The contract is for software model development and testing services to support certification of new or modified Tactical Cross Domain Solution (TACDS) hardware, firmware, software, and/or rule sets, including one filter component. The services are to be applied to the Joint Threat Warning System (JTWS) Program of Record. This is a sole-source award under FAR 13.106-1(b)(1)(i) with no set-aside designation. GDMS is a major provider of Command, Control, Communications, Computers, Intelligence, Surveillance, and Reconnaissance (C4ISR) solutions to federal agencies and holds several significant Indefinite Delivery Vehicle (IDV) contracts, demonstrating its strategic importance to the Department of Defense and other government customers.