- The United States Air Force and Northrop Grumman have begun prototyping a new launch silo tube for the Sentinel intercontinental ballistic missile program.
- The modular silo design is intended to accelerate deployment of 450 launch sites while improving maintainability and reducing long-term costs.
The United States Air Force, in partnership with Northrop Grumman and Bechtel, is accelerating development of the Sentinel intercontinental ballistic missile system by prototyping a new launch silo tube, the companies announced on Friday.
According to Northrop Grumman, the launch silo tube serves as the central element of a new modular infrastructure concept that is intended to support the construction of 450 future Sentinel launch silos. The prototype will be used to validate both the structural design and the construction approach for the new silo system.
As noted by the company, the prototype was initiated within three months of concept review by the United States Air Force, with construction already underway. The accelerated timeline is aimed at compressing what is traditionally a multi-year development process into a shorter production cycle.
The Sentinel program is designed to modernize the land-based component of the United States’ strategic nuclear forces and is expected to remain operational through at least 2075. The new silo design is intended to improve maintainability and reduce long-term operational costs while supporting rapid deployment.
In a statement, Sarah Willoughby, vice president and general manager of Strategic Deterrent Systems at Northrop Grumman, said: “Sentinel is a national security priority and proving out the launch silo concept is critical to creating a repeatable approach that will accelerate deployment of a fully fielded Sentinel system.”
She added: “The shift in Sentinel silo construction will improve quality and provide a secure, survivable and cost-effective launch silo that is more efficient to maintain.”
Bechtel, which is partnered with Northrop Grumman on the infrastructure component of the program, is responsible for aspects of the construction and engineering design. The company said the prototype will help validate execution plans and reduce risk ahead of broader deployment.
Mike Costas, senior vice president and general manager of Defense and Space for Bechtel’s Nuclear, Security, and Environmental business unit, said: “We are honored to be a part of the Sentinel mission to deliver the next generation of national security.”
He added: “The prototype missile silo builds the foundation needed for us to be successful in the field. It builds confidence in our execution plans, while mitigating risks to delivery.”
The launch silo tube forms the core structural component of an underground missile silo, housing the missile and supporting launch operations. The modular design approach allows for standardized construction across multiple sites, which can reduce build time and simplify maintenance.
The new design is intended to support improved access for maintenance crews and enable upgrades over the lifecycle of the system. By standardizing components and construction methods, the program aims to create a repeatable process for deploying large numbers of silos.
The Sentinel system will replace the Minuteman III as the United States’ land-based intercontinental ballistic missile. These systems form one leg of the nuclear triad, alongside submarine-launched ballistic missiles and strategic bombers, providing a continuous deterrent capability.
The development of a new silo infrastructure reflects the need to sustain long-term readiness of the ICBM force while adapting to modern engineering standards and operational requirements. The ability to construct and maintain silos efficiently is central to maintaining force availability.