US just scrapped 450 nuclear missile silos, the reason is cost

The US Air Force’s plan to modernize its nuclear missile arsenal is taking a new turn - literally underground. Instead of upgrading existing silos (missile launch facility), the military will now mostly build new ones to house the next-generation Sentinel intercontinental ballistic missiles (ICBMs).

This is quite a shift from the original approach, where the initial plan was to reuse 450 silos currently holding Minuteman III missiles. But after running into serious engineering and cost hurdles during a test project in California, officials concluded that retrofitting the old silos would be more trouble than it's worth.

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However, the decision adds complexity to the Sentinel program, which is already under scrutiny for its ballooning budget and delays. The total cost has surged past $125 billion—about 37 per cent higher than first expected.

The new silos will be built mainly on existing Air Force land, including missile fields spread across Colorado, Wyoming, Montana, Nebraska, and North Dakota. These fields will host 400 deployed missiles out of a planned inventory of 634.

The Air Force stresses that the change in strategy won’t derail the program's timeline. Officials still expect the Sentinel missiles to begin replacing the aging Minuteman III fleet by the early 2030s. The aim is to keep America’s already strong land-based nuclear deterrent modernized and secure well into the future.

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The Sentinel ICBM is a key piece of the US nuclear triad, which also includes submarine-launched missiles and strategic bombers. With ongoing escalations between India and Pakistan and other major powers modernizing their arsenals, US defense leaders say the new missile system is critical.

Still, the pivot to building brand-new silos reflects just how complicated and expensive updating Cold War-era infrastructure can be. It may not be a major challenge for the Pentagon to keep the program on track regarding budget and schedule, but it is interesting to see if the defense sector budget will keep growing under the Trump administration.