The Missile Defense Agency (MDA) intends to increase the contract ceiling for HQ0851-21-D-0001, which pertains to Sustaining Engineering and Product Support for Standard Missile-3 Block IA, IB, and IIA All Up Round Missiles. This contract action aims to accommodate the MDA's heightened demand for complex and highly technical services, including technical baseline engineering, cybersecurity, and foreign military sales activities, without altering the existing contract period of performance. The continuity of these critical services is essential for maintaining the agency's capability enhancements, as Raytheon is identified as the sole source capable of fulfilling these requirements within the necessary timeframe. Interested parties can reach out to Amy Roark at amy.roark@mda.mil or call 256-450-1781 for further inquiries, noting that this notice is not a request for competitive proposals and no formal solicitation package is available.