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Northrop Grumman, in partnership with the United States Air Force, has successfully completed the first qualification test of the stage two solid rocket motor for the next-generation Sentinel intercontinental ballistic missile.
The test took place at Air Force’s Arnold Engineering Development Complex in Tennessee, inside a vacuum chamber that simulated high-altitude flight conditions.
The milestone test allowed engineers to evaluate the rocket motor’s thrust vector control system, a critical component that steers the missile during flight.
The qualification marks a key step in advancing the Sentinel program, which is being developed to replace the ageing LGM-30G Minuteman III fleet that has formed the backbone of America’s ground-based nuclear deterrent since the 1970s.
Ben Davies, corporate vice president and president of Northrop Grumman Defense Systems, said the successful trial underscored the urgency and innovation driving the program, saying, “Developing the Sentinel Weapon System quickly is vital for national security. A digital-first approach helps us speed up the process and ensures the missile is mission-ready.”
The Sentinel program, previously known as the Ground Based Strategic Deterrent, is one of the most ambitious and expensive components of the United States’ nuclear modernisation efforts.
Northrop Grumman was awarded the primary development and integration contract in 2020, with the total program cost estimated to exceed US$100 billion over its life cycle. The missile system is expected to remain in service into the 2070s.
To date, Northrop Grumman and the US Air Force have successfully tested all three solid propellant stages of the Sentinel missile. This recent stage two qualification test is the first in a series designed to validate digital engineering models and finalise the stage’s flight-ready configuration.
Each test is structured to evaluate specific components and performance parameters, helping to reduce developmental risk and optimise the final design. This latest test builds upon earlier work involving stage one and development-stage rocket motors, contributing vital data for ongoing missile design, command and control systems, security enhancements and support infrastructure.
The Sentinel Weapon System represents a broader push by the United States to transition to a digitally engineered nuclear deterrent. This approach integrates advanced modelling and simulation tools throughout the design and manufacturing process, aiming to reduce costs, compress development timelines and improve reliability.
The Sentinel missile is expected to begin deployment later this decade, replacing nearly 400 Minuteman III missiles currently housed across US missile fields in Montana, North Dakota and Wyoming.
