The U.S. is burying 450 new missile silos across the country. What the Sentinel ICBM really means for the world.
May 2026 · 12 min read
Image Credit: Leonardo AI
News Summary
- The U.S. Air Force broke ground on the first prototype Sentinel ICBM silo in Promontory, Utah, on March 27, 2026, replacing 50-year-old Minuteman III infrastructure.
- The Sentinel program now carries a verified cost estimate of at least $140.9 billion, up 81 percent from its original $77.7 billion projection.
- The New START arms control treaty between the U.S. and Russia expired in February 2026, leaving no binding nuclear limits between the two countries for the first time since the Cold War ended.
- 450 brand-new silos will be constructed across five U.S. states covering more than 40,000 square miles, making this the largest military infrastructure project in modern American history.
- The Minuteman III, designed for a 10-year service life in 1970, may now remain operational until 2050, four decades past its intended retirement date.
A missile sitting in a silo in Wyoming right now, built when your parents were children, can reach Moscow in 30 minutes. America decided that was acceptable for 50 years. It has now changed its mind. The bill, the scale, and the timing of that decision reveal everything about where the world is heading.
What Is the Sentinel ICBM and Why Does It Exist
The United States has kept land-based nuclear missiles in underground silos since the early 1960s. The current missile, the Minuteman III, entered service in 1970. It was designed to last 10 years. Somehow, it is still sitting there, armed and on alert. That single fact tells you more about military bureaucracy, Cold War inertia, and defense budget politics than most books ever will.
The LGM-35A Sentinel is the system built to replace it. Developed by Northrop Grumman under a sole-source contract awarded in 2020, the Sentinel is not simply a new missile. The Air Force describes it as a comprehensive, once-in-a-generation modernization of the entire land-based leg of the nuclear triad, covering launch facilities, command centers, and thousands of miles of underground infrastructure across five states.
The Sentinel carries W87-0 and W87-1 thermonuclear warheads with a yield between 300 and 475 kilotons of TNT and a range exceeding 3,500 miles. For context, the atomic bomb used on Hiroshima in 1945 yielded approximately 15 kilotons. A single Sentinel warhead is more than 20 times more powerful. If you needed one number to sit with, that is the one.
The program is designed to serve through 2075. That means a missile approved in 2020 will still be on alert when people alive today are well into their seventies. Decisions made in Pentagon conference rooms this year will shape the security of a world most of us will not live to see fully.
For a broader look at how modern missiles shape conflict today, read our analysis of the missiles that matter most in modern warfare.
Why America Chose to Build New Silos Instead of Fixing Old Ones
The original plan made obvious sense on paper. Take the existing 450 Minuteman III silos, renovate them, and lower the new Sentinel missiles in. Efficient, relatively economical, and far less disruptive than starting from scratch. That plan fell apart the moment engineers looked seriously at what was actually underground.
According to The National Interest, the 450 missile silos spread across five states are connected by thousands of miles of cables and wires dating back to the original Minuteman construction in the early 1960s. Engineers found asbestos, lead paint, severe structural deterioration, and entirely incompatible communications infrastructure. An ongoing study into elevated cancer rates among missile maintenance crew members added urgency to the decision. Refurbishing 450 unique, aging, underground structures built over five separate decades would have cost more and taken longer than building new ones from scratch.
On March 27, 2026, the Air Force and Northrop Grumman broke ground on a prototype replacement silo in Promontory, Utah. Unlike the original poured-concrete silos, the new Sentinel silo uses factory-made, pre-cast, interchangeable concrete sections shipped to the site and assembled modularly. The approach eliminates the unpredictable costs of excavating legacy structures and allows construction to proceed without taking active alert missiles offline, something the Air Force could not reliably achieve through renovation.
The 450 new silos will sit on the same geographic footprint as the existing ones across Montana, North Dakota, Wyoming, Colorado, and Nebraska. The wider program also involves modernizing over 600 facilities across approximately 40,000 square miles of U.S. territory. The Heritage Foundation has compared the scale of this undertaking to the construction of the Eisenhower interstate highway system, noting it will employ a comparable number of workers across construction, electronics, engineering, and security disciplines.
The Nuclear Triad Explained: What It Is and Why It Still Matters in 2026
To understand why the United States spends this kind of money on land-based nuclear missiles, you need to understand the logic of the nuclear triad. The concept is not complicated. The consequences of misunderstanding it, however, are significant.
The United States fields nuclear weapons across three distinct platforms: land-based intercontinental ballistic missiles in underground silos, submarine-launched ballistic missiles on nuclear-powered submarines at sea, and strategic bombers carrying nuclear-capable weapons in the air. According to Britannica, the underlying theory is that spreading nuclear assets across three radically different platforms makes it nearly impossible for any adversary to destroy all of them in a single strike.
Each leg serves a specific purpose. The Center for Arms Control and Non-Proliferation explains that ICBMs remain on prompt alert and can launch within minutes of a presidential order. Submarines at sea are virtually undetectable and provide a guaranteed second-strike capability. Strategic bombers are visible, which makes them useful as a signal of intent during a crisis, because their presence communicates resolve without requiring a launch.
The specific strategic value of land-based ICBMs comes from what defense planners call the sponge theory. If an adversary wants to neutralize the ICBM force before launching a broader attack, they must fire at least two nuclear warheads at every silo, because one might miss. With 450 silos distributed across five states, an enemy needs to launch 900 or more warheads just to target the land-based leg alone. That is an enormous first-strike cost, and it is the entire point of the geographic dispersion.
The Atlantic Council notes that the three legs of the nuclear triad are mutually supporting, making the combined system significantly more resilient than any single component could be on its own. Multiple U.S. administrations across both parties, from Obama to Trump to Biden, endorsed maintaining all three legs, which says something about the durability of this strategic logic across ideological lines.
For a deeper look at how nuclear deterrence actually functions in a world without active treaties, read our piece on nuclear deterrence with no treaty and no rules in 2026.
The Cost Crisis Nobody Wants to Talk About
Here is where the story gets genuinely uncomfortable, and where most mainstream coverage tends to look away quickly.
The Sentinel program started with an estimated price of $77.7 billion. That number is now a piece of history. In January 2024, the Air Force publicly disclosed that program costs had risen to over $125 billion, far exceeding the baseline. By the time a mandated restructuring was complete, the verified figure reached at least $140.9 billion, an 81 percent increase over the 2020 baseline. The Pentagon's own cost assessment office placed the total 50-year lifecycle cost at $264 billion in 2020, before the overruns hit. Independent analysts now estimate the full lifecycle figure could reach $300 billion, with an additional $15 billion for the new W87-1 warhead production program.
The scale of cost growth triggered a Nunn-McCurdy breach in 2024, a legal mechanism requiring the Defense Secretary to certify to Congress that no viable alternative exists and that the program must continue. Defense Secretary Lloyd Austin made that certification. The U.S. Government Accountability Office confirmed in its classified April 2025 report, released publicly in September 2025, that the Sentinel transition is the most complex infrastructure project the Air Force has ever attempted, and flagged the absence of a formal transition risk management plan as a serious structural weakness that needed immediate attention.
The cost story carries a subplot that drew sharp attention on Capitol Hill. In 2025, Air Force Secretary Troy Meink disclosed to members of Congress that $934 million had been diverted from the Sentinel development account, reportedly connected to the temporary modification of a Qatari aircraft to serve as Air Force One. The New Space Economy assessment flagged that disclosure as adding serious political scrutiny to a program already under sustained congressional oversight.
The Arms Control Association documented that the cost per individual Sentinel missile rose from an original projection of $118 million to approximately $162 million per unit. For a program procuring 659 missiles total, that per-unit increase compounds into tens of billions of additional spending across procurement alone.
The Federation of American Scientists published a detailed critique arguing that the Air Force's original cost comparison was structurally flawed, designed to make a new missile look cheaper than a life extension of the Minuteman III by requiring the alternative scenario to fund a follow-on missile all the way to 2075. That requirement artificially inflated the comparative cost of any alternative and made the Sentinel appear like the obvious economic choice when it was not.
A real-world parallel worth understanding: the F-35 fighter jet program, often cited as the most expensive weapons acquisition in U.S. history, currently carries a lifetime cost of approximately $1.7 trillion. The Sentinel is a fraction of that figure on procurement alone, but the pattern of cost growth, delayed timelines, and contractor dependency is nearly identical. In both cases, the government awarded a sole-source contract to a single prime contractor and discovered mid-development that the original estimates bore little resemblance to reality.
For context on how nuclear infrastructure spending intersects with regulatory gaps, see our investigation into dangerous legal loopholes in nuclear infrastructure and uranium supply chains.
Old Missiles, Real Risks: The Minuteman III Problem
Because the Sentinel program keeps running behind schedule and over budget, the Minuteman III cannot retire. A missile system with a 10-year design life, built in the early 1970s, will now potentially remain on alert until 2050. That is not a rounding error. That is the documented assessment of the United States Air Force itself.
The Defense News report on the GAO findings confirmed that the Air Force is actively evaluating options to operate Minuteman III through 2050, citing accelerating concerns about parts obsolescence across electrical subsystems, including diodes, resistors, and capacitors aging beyond their rated service limits. Some of those components no longer exist in current manufacturing supply chains. Air Force maintenance teams hunt down surviving inventory or commission custom fabrication at considerable expense and with no guarantee of availability.
The human dimension of this problem rarely appears in the coverage. Missile maintenance crews at Malmstrom Air Force Base in Montana, F.E. Warren in Wyoming, and Minot in North Dakota work 60 feet underground in hardened launch control capsules on 24-hour alert shifts routinely extended to 48 hours, each crew responsible for monitoring 10 nearby silos. Crew members documented deteriorating work conditions and reported elevated rates of cancer and other serious illnesses over extended careers. The Air Force acknowledged that an ongoing study into missileer cancer rates factored directly into the decision to build entirely new silos rather than renovate the existing structures.
One technical option the GAO raised to bridge the capability gap during Sentinel's delayed arrival: converting Minuteman III missiles from their current single-warhead configuration to MIRV, meaning Multiple Independently Targetable Reentry Vehicles. Each missile could then carry up to three separately targeted warheads. Fewer physical missiles would maintain the same deterrent coverage, buying time while Sentinel completes development. The Air Force agreed with this recommendation in principle.
For context on the personnel side of America's nuclear infrastructure, read our report on U.S. nuclear scientists who died or went missing under FBI investigation.
A World Without a Nuclear Treaty
Timing matters in every story. The Sentinel program's acceleration is not happening in a neutral geopolitical environment. It is happening at the exact moment the last meaningful arms control framework between the world's two largest nuclear powers collapsed without a replacement.
New START, the treaty that capped U.S. and Russian deployed strategic nuclear warheads at 1,550 each and provided mutual verification mechanisms, expired on February 5, 2026. Russia had suspended its participation in February 2023. The Congressional Research Service confirms that no replacement arms control framework currently exists between the United States and Russia, the two nations that together hold approximately 90 percent of all nuclear warheads on earth.
The broader global picture is equally significant. Nine countries now field operational ICBMs or intercontinental-range submarine-launched missiles. No binding international treaty limits what any of them can build or deploy. China has loaded over 100 DF-31-class ICBMs into newly constructed silo fields in a pattern representing the fastest pace of nuclear infrastructure expansion China has undertaken since the Cold War. The Bulletin of the Atomic Scientists and the Stockholm International Peace Research Institute both estimated China's nuclear stockpile at approximately 600 warheads as of 2025, a significant increase from earlier assessments.
Russia's RS-28 Sarmat, the missile NATO designates Satan 2, experienced five publicly documented test failures since 2022, including a silo-destroying accident in September 2024 and a crash near the launch site in November 2025. Despite those failures, it remains a formal part of Russian strategic doctrine. North Korea conducted a solid-fuel rocket engine ground test in March 2026 that South Korean intelligence assessed as intended for a new carbon-fibre ICBM capable of carrying multiple warheads to targets throughout North America.
The core arithmetic of nuclear deterrence has not changed since 1959. A missile in a silo in North Dakota can reach Moscow in approximately 30 minutes. A missile in Russia can reach Washington in roughly the same window. What has changed is that more countries now run that calculation, fewer rules constrain the outcome, and the last framework designed to keep the numbers manageable has expired without a successor.
To understand who controls the uranium that makes all of this possible, see our report on the 10 countries that own the world's uranium supply.
The Case Against the Sentinel Program
This is not a story with one legitimate side, and treating it as such would not serve anyone reading it honestly.
Former Defense Secretary William Perry wrote in The New York Times that the United States can safely eliminate its land-based ICBM force entirely, arguing that the submarine and bomber legs of the triad are accurate, survivable, and sufficient to maintain credible deterrence on their own. Perry, who held his position during the Clinton administration and spent decades working directly on nuclear policy, argued that ICBMs increase rather than reduce the risk of accidental nuclear war. Their fixed location makes them permanent targets. Their rapid-launch posture means a president could face a launch decision based on faulty radar data with no time for confirmation or reconsideration.
This is not a theoretical concern. In 1983, a Soviet satellite early-warning system malfunctioned and falsely indicated an incoming U.S. nuclear strike. Soviet officer Stanislav Petrov chose to treat the alert as a false alarm rather than trigger a response. His judgment, made in minutes, may have prevented nuclear war. The launch-on-warning posture that critics identify as dangerous in the Sentinel program is the same posture that produced that near-miss more than 40 years ago. The Federation of American Scientists has published detailed technical analyses arguing that Sentinel does nothing to change this fundamental risk.
A 2020 survey cited by the Center for Arms Control and Non-Proliferation found that 61 percent of Americans, including majorities of both Republicans and Democrats, support phasing out land-based ICBMs as outdated, destabilizing, and prohibitively expensive. A separate University of Maryland survey polled nearly 86,000 individuals and reached a similar conclusion.
The Heritage Foundation offers the counterargument. Eliminating the ICBM leg of the triad directly frees up adversary missiles currently targeted at U.S. silos, allowing them to be retargeted at American cities, military bases, and submarine ports. Retiring ICBMs, in this view, functions as a de facto force multiplier for adversary nuclear arsenals. RAND Corporation analysts echoed this point in a 2022 analysis, noting that eliminating land-based missiles would be potentially destabilizing at a moment when adversaries are expanding, not reducing, their own capabilities.
Both sides work from real logic. That is precisely what makes this debate genuinely difficult. It is not an argument between people who want security and people who do not. It is an argument about which category of risk is more tolerable: the financial and humanitarian cost of building and maintaining nuclear weapons systems at enormous ongoing expense, or the strategic cost of appearing vulnerable to adversaries who study American decision-making very carefully.
For a grounded perspective on why nuclear deterrence, flawed as it is, still functions as a global security mechanism, see our piece on why nuclear deterrence remains an imperfect but functioning global safeguard.
What America Building New Nuclear Missile Silos Means for Ordinary People
Nuclear strategy tends to be discussed in rooms most people never enter. But the Sentinel program carries real consequences for everyday American life that rarely appear in the same coverage as the warhead counts and treaty timelines.
The economic footprint is substantial. The Air Force is constructing or modernizing 600 facilities across five states and connecting them with thousands of miles of new secure underground infrastructure. That translates directly into construction employment, contractor work, supply chain activity, and long-term operational positions in states where federal military spending represents a major portion of the local economy. Wyoming, Montana, and North Dakota, the three states hosting the largest concentrations of ICBM infrastructure, rank among the least economically diversified in the country. F.E. Warren Air Force Base outside Cheyenne, Wyoming, for example, is consistently one of the largest employers in the region. The Sentinel construction program represents the most significant injection of federal economic activity into those communities in generations.
The fiscal reality is equally concrete. At $140.9 billion for procurement alone, and a total lifecycle cost potentially reaching $300 billion, this program will consume defense budget resources for the next five decades. The Stars and Stripes reported that the Air Force is already working through how to absorb the financial impact of simultaneous cost growth in both Sentinel development and continued Minuteman III maintenance. Every dollar committed to a new silo in Wyoming is a dollar not available elsewhere in the federal budget, and that tradeoff plays out across healthcare, infrastructure, education, and other defense programs for years to come.
The public health dimension is one that the Air Force has now formally acknowledged. Communities surrounding Malmstrom in Montana, Minot in North Dakota, and F.E. Warren in Wyoming live adjacent to nuclear deterrence, not as a concept but as a physical reality. The disclosure that existing silos contained asbestos and lead paint, combined with documented elevated cancer rates among missile crews, extends beyond military personnel to the broader populations near these installations. The decision to build new silos rather than renovate existing ones was partly driven by this acknowledgment, which is an unusual admission from a program that spent decades insisting the old infrastructure was adequate.
For context on the broader evolution of military technology and what is changing beyond ICBM programs, read our analysis of small, cheap, and deadly weapons reshaping modern warfare. And for the economic picture of global arms spending, see the 10 countries currently importing the most weapons worldwide.
The Bigger Picture
America building 450 new nuclear missile silos is not a procurement story in the conventional sense. It is a statement. It tells Russia, China, North Korea, and every other country watching that the United States intends to remain the most capable nuclear power on earth through at least 2075, regardless of cost overruns, public debate, shifting administrations, or the absence of arms control treaties to define the boundaries.
The Minuteman III, a system that should have been decommissioned before most people reading this were born, will remain on 24-hour alert until its replacement is ready. The Sentinel, a program with a troubled acquisition record and a price tag that grew by 81 percent before a single operational missile was deployed, will eventually take its place. Construction on the first prototype silo has begun in Utah. 450 new silos will rise from the same American plains where the originals have stood since before the Moon landing.
None of this exists because no one in Washington wants a nuclear war. It exists because the logic of deterrence, refined over seven decades and never formally abandoned, demands that no adversary ever rationally conclude they can strike first and survive the response. Whether that logic remains sound in a world of hypersonic glide vehicles, artificial intelligence-assisted targeting, cyberattacks on command and control systems, and no active arms control framework is the question that defense planners, arms control scholars, and national security lawyers actively debate right now, without resolution.
What is certain is this: the ground in Utah has been broken. The contracts are signed. The program will be restructured by the end of 2026, conduct its first test launch in 2027, and reach initial operational capability in the early 2030s. The 30-minute clock that defined global security since the Cold War is being reset with a new missile, new silos, and no treaty telling anyone on either side of the equation where the line is.
That is worth understanding. Not because there is an easy answer, but because the decisions made right now will shape the world for the next 50 years, long after the headlines have moved on.
Do you think the United States is right to spend $300 billion rebuilding its nuclear arsenal at a time when no arms control treaty exists? Share your thoughts below.
Recent Articles
- Everyone is waiting for UFO Files. The Bigger Question is what if they disappoint?
- War, Tariffs, Chaos: Big Tech just had its best Quarter Since 2021
- Cristiano Ronaldo Has 5 Games to End Al Nassr’s 3-Year Saudi Pro League Title Drought
Sources
- Air and Space Forces Magazine - Sentinel ICBM First Launch 2027, Operational by Early 2030s
- The National Interest - U.S. Air Force Could Finish Restructuring Sentinel ICBM Program This Year
- Army Recognition - U.S. Funds $4.6 Billion Sentinel ICBM to Replace Minuteman III
- New Atlas - U.S. Air Force Breaks Ground on Next-Generation Nuclear Missile Silo
- Wikipedia - LGM-35 Sentinel
- U.S. Government Accountability Office - ICBM Modernization: Air Force Actions Needed to Address Critical Risks to Sentinel Transition
- Defense News - Air Force May Keep Minuteman III Nukes Operating Until 2050
- Arms Control Association - Sentinel ICBM Exceeds Projected Cost by 37 Percent
- The Heritage Foundation - Modernizing America's Nukes: The Stakes of the Sentinel ICBM Project
- Center for Arms Control and Non-Proliferation - Fact Sheet: The Nuclear Triad
- Atlantic Council - In Defense of the U.S. Maintaining a Balanced Nuclear Triad
- New Space Economy - The World's Operational ICBMs: A 2026 Assessment
- Britannica - Nuclear Triad
- Congressional Research Service - Defense Primer: Strategic Nuclear Forces
- Federation of American Scientists - The Two-Hundred Billion Dollar Boondoggle
- Stars and Stripes - New ICBM Program on Track for Prototype Decision by End of Year