The Sentinel programme involves more than 450 new missiles, a vast nuclear command and control network, and hundreds of infrastructure projects across five states. Northrop Grumman, leading the industry team, is working to deliver what it calls “the most technologically advanced intercontinental ballistic missile (ICBM) system to stay on alert through 2075.”
The current Minuteman III ICBM, designed in the 1960s and deployed in the 1970s, was originally intended for just a decade of service. While refurbishing its 450 silos proved costly and complex, building new silos allows for “more efficient design concepts, achieve predictable cost estimates, consider parallel construction efforts and optimize Sentinel deployment.”
In 2024, Northrop Grumman examined ten alternative silo designs across 32 scenarios, factoring in workforce, supply chains and geographical constraints. Together with the Air Force, it selected a concept “projected to significantly decrease fielding time and acquisition costs compared to projected estimates for using the original silos.”
During construction, Minuteman III missiles will remain on alert to ensure a seamless transition. “Design decisions matter – especially when it comes to the bedrock of U.S. national security. Northrop Grumman is designing the entire weapon system from below the ground up with innovation at its core.”
Full ICBM modernisation has not been attempted in over six decades, but the programme is described as “a generational leap.” Northrop Grumman, working with the Air Force and a network of suppliers, is investing in the industrial base, maturing the design and reducing risk to make Sentinel a reality.
Once deployed, the modular Sentinel system is expected to deliver improved range, accuracy, resiliency and flexibility. “Grounded in digital engineering, Northrop Grumman is transforming the way the system is being designed and produced. The result: enhanced performance, faster, more accurate decision-making for the warfighter and enduring deterrence that will protect generations to come.”
Source: Northrop Grumman.
