The SM-2 Block IIIC/CU medium-range surface-to-air missile was showcased at the Surface Navy Association (SNA) 2026 Symposium, offering a closer look at the latest evolution of the U.S. Navy’s Standard Missile-2 family. The display highlighted how the upgraded interceptor is being positioned to remain a central component of fleet air defense against modern aerial threats.
Designated RIM-66P, the SM-2 Block IIIC/CU introduces a hybrid guidance architecture that combines semi-active and active radio-frequency seekers, alongside upgraded control systems and modernized internal electronics. Rather than a full redesign, the program emphasizes service-life extension and performance enhancement, while ensuring full compatibility with existing naval launchers such as the Mk 41 Vertical Launch System.
The Block IIIC originated as a rapid prototyping initiative, achieving interim operational capability in late 2022. Testing conducted through fiscal year 2023 included live missile firings, advanced modeling and simulation, and cyber resilience evaluations to support early deployment decisions. The follow-on Block IIICU entered the formal acquisition pipeline in 2023, with initial operational testing scheduled for fiscal year 2027, reflecting the Navy’s incremental modernization strategy.
A defining feature of both variants is the replacement of the legacy semi-active seeker with a dual-mode seeker derived from the SM-6, reducing reliance on continuous shipboard radar illumination. This enhancement improves engagement flexibility during complex air defense operations and supports Naval Integrated Fire Control–Counter Air (NIFC-CA) missions using off-board sensor data. Retaining the proven propulsion system and dimensions of earlier SM-2 models, the missile continues to deliver high-speed, medium-range defense against aircraft and anti-ship cruise missiles.
