The SM-6 Block IB, one of the U.S. Navy’s future time sensitive strike weapons soon to be fielded, has been put on hold due to ‘internal deliberations’.
The U.S. Navy’s Fiscal Year 2026 budget has cut another upcoming hypersonic missile program expected for the fleet—this time the SM-6 Block IB. The decision to begin a ‘strategic pause’ comes on the heels of a major cancellation of the fleet’s Hypersonic Air Launched Offensive (HALO) missile which Naval News reported was cancelled in April.
Unlike HALO, the SM-6 Block IB was going to be powered by a new 21-inch solid rocket motor, making full use of the Mark 41 VLS cell dimensions to maximize speed and range. The U.S. Navy’s Program Executive Office, Integrated Warfare Systems (PEO IWS) unveiled a new rendering of its design during the Surface Navy Association 2025 conference in January with essentially a brand new missile body, marking a departure from the ‘Standard’ missile design, similar to the SM-3 Block IIA.
The Block IB variant is slated to have an anti-surface capability at speeds exceeding Mach 5, with additional capability for ballistic missile defense (BMD) and anti-air warfare (AAW), matching the current SM-6 Block IAU which the missile builds off of.
“The Standard Missile-6 (SM-6) Block IB is an upgrade of the SM-6 Block IAU, which provides long-range fires capability by implementing improved software and replacing the existing Mk 104 Dual-Thrust Rocket Motor (DTRM) with a new 21-inch rocket motor to extend the range. The SM-6 Block IB delivers to the Navy and Joint Force a transformative multi-domain, multi-mission offensive hypersonic kinetic capability.”
U.S. Navy FY2026 Budget Documentation
While the missile isn’t fully cancelled, funding has been halved from $162 million to $83 million. This still allows for the development of the 21-inch SRM to continue, as well as some prototyping efforts related to the missile as it builds up to what could be a first extended range flight test if the pause is lifted.
Some efforts will continue while an In Process Review (IPR) is completed in this fiscal year, which, according to the U.S. Navy, will be done “to establish the initial product design and begin qualification and insensitive munitions testing at the rocket motor level.”
“Funding decrease in the amount of $78.674M supports focused efforts on the 21” SSRM DVT, qualification, &
U.S. Navy FY2026 Budget Documentation
flight test efforts.”
Ultimately, the U.S. Navy has cut funding for large portions of planned SM-6 Block IB development and test efforts, opting to focus funding exclusively on the 21-inch SRM, which could be used for other weapons already primed for high speed strike missions. But despite that, the budget documentation released outlines a plan for new communication systems and an extended range demo.
“Pending a missile development restart decision, the program will integrate extended range communications into the missile and conduct an extended range demonstration of the SM-6 BLK IB missile under a prototyping effort.”
U.S. Navy FY2026 Budget Documentation
This leaves the future of yet another U.S. Navy hypersonic program unclear, following closely in the path of HALO which was quietly shuttered as development encountered more and more roadblocks.
