The “doomsday machine” in this headline is Sentinel, the U.S. Air Force program to replace the Minuteman III land-based nuclear missile system. The $140.9 billion estimate—usually rounded to $141 billion—covers a missile and a vast network of launch, command and communications infrastructure. The Congressional Budget Office reported the figure in 2025 as a constant-2020-dollar estimate announced by the Defense Department in July 2024; it is not the price of the entire U.S. nuclear arsenal.
What is the $141 billion Sentinel program?
Sentinel is intended to replace the Air Force’s Minuteman III intercontinental ballistic missiles (ICBMs), which are part of the U.S. nuclear force. The Defense Department’s July 2024 Nunn–McCurdy review put the total acquisition estimate for a “reasonably modified” Sentinel program at $140.9 billion. The CBO’s 2025 account expresses that estimate in constant 2020 dollars and notes that it includes costs outside the years in its own 2025–2034 projection. The Defense Department announced the review’s result in July 2024; the CBO explains the estimate and its dollar basis.
In the CBO’s 2025 report, the $140.9 billion estimate is 81 percent, or $63 billion, above the program’s $78 billion 2020 baseline. It is also 33 percent, or $34 billion, above the $106 billion estimate in the Defense Department’s December 2023 Selected Acquisition Report. These are comparisons reported by the CBO, not a new post-restructuring life-cycle estimate.
What does the estimate pay for?
Calling Sentinel a “$141 billion missile” is shorthand. The program includes the missile, extensive work at existing launch sites, and the systems that connect and control them. The CBO says Sentinel calls for refurbishment or replacement of all 450 existing silos, new command, control and communications equipment at those silos and 45 launch control centers, fiber-optic links to replace connecting cables, and equipment that would allow ICBMs to be commanded remotely from certain aircraft.
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The CBO attributes most of the recent cost growth to silo and launch-control-center modernization and the transition from Minuteman III to Sentinel, rather than to the missile alone. That distinction matters: the estimate covers a system-wide acquisition effort, not simply the development and purchase of a new weapon.
How does Sentinel fit into the wider nuclear-force bill?
The Sentinel estimate is separate from the CBO’s broader projection of nuclear-force costs. In a 2025 report based on Defense Department and Department of Energy budget requests submitted in March 2024, the CBO projected $946 billion in costs over 2025–2034—about $95 billion per year on average. This is a projection from those requests, not a final accounting of spending or a current enacted-budget total.
| CBO cost category, 2025–2034 | Projected amount | What it covers |
|---|---|---|
| Operations and sustainment | $357 billion | Operating and maintaining nuclear forces and systems |
| Modernization of delivery systems and weapons | $309 billion | Planned updates to nuclear delivery systems and weapons |
| DOE nuclear-weapons laboratory facilities | $72 billion | Facilities at Department of Energy nuclear-weapons laboratories |
| DoD NC3 and early-warning modernization | $79 billion | A modernization component of command, control, communications and early-warning systems |
| Potential additional costs | $129 billion | Costs modeled by the CBO using historical cost growth |
| Total | $946 billion | CBO projection based on FY2025 budget requests submitted in March 2024 |
The CBO separately projects $154 billion for Defense Department nuclear command, control, communications and early-warning systems over 2025–2034, counting both operations and sustainment and modernization. The $79 billion modernization figure in the table is part of that $154 billion, not an additional amount to add on top. NC3 is also not another name for Sentinel. The Government Accountability Office’s 2015 description calls it a large system of land-, air- and space-based components intended to assure connectivity between the President and nuclear forces; that is a historical description, not a current inventory. GAO’s 2015 report describes NC3.
What is Sentinel’s status, and what remains uncertain?
After the cost breach, the Under Secretary of Defense for Acquisition and Sustainment rescinded Sentinel’s Milestone B approval and its related program baselines. The Air Force is restructuring the program and working toward a new Milestone B approval. GAO’s February 18, 2026 snapshot identifies continuing concerns including software-development delays, unfinished software design metrics, design-tool issues and an unfinished launch-facility design. GAO’s February 2026 program snapshot reports that the first Sentinel flight was planned for March 2028, about four years later than original estimates. That is a plan, not a guaranteed date.
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Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →GAO said the Air Force estimated Sentinel would cost at least $141 billion, while actual costs remain uncertain. A February 2026 Defense One report said officials expected a new estimate by the end of that year; that reported expectation is not itself a revised, published program total. Defense One reported the expected timing.
The transition from Minuteman III is a separate risk
Sentinel’s delay also affects how long the existing system may need to operate. GAO’s 2025 transition review said plans were on hold while the Defense Department restructured Sentinel and that, as of April 2025, there was no updated transition schedule. GAO’s February 2026 snapshot says Minuteman III may need to remain in service through 2050—14 years longer than planned—and flags sustainment and flight-test risks. These are planning concerns, not evidence that a gap in nuclear capability has occurred. GAO’s 2025 review covers transition planning.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why is the value of land-based ICBMs disputed?
The policy question is whether land-based missiles contribute enough deterrence and response value to justify their expense, infrastructure demands and risks. The official cost and schedule reports illuminate the acquisition and transition challenges; they do not establish which nuclear force structure is strategically best.
Critics argue that fixed silos could act as a “nuclear sponge,” drawing an adversary’s weapons toward sparsely populated areas, or that the silos add little strategic value. In a 2024 WIRED article, Joseph Cirincione, a former president of the Ploughshares Fund, argued that using ICBMs could be catastrophic even without an adversary striking the United States. Tara Drozdenko of the Union of Concerned Scientists questioned the utility of the silos. Those are attributed critical perspectives, not official findings or a settled consensus. WIRED’s 2024 article presents those arguments and the opposing view.
Senator Deb Fischer, by contrast, has argued that heartland ICBM sites are unlikely to be targeted. Whether fixed missiles strengthen deterrence, create vulnerabilities or affect an adversary’s calculations is contested; neither side’s strategic judgment should be treated as established fact. Any comparison of force-structure choices also has to account for responsiveness, survivability, escalation and launch-decision pressures, long-term costs, infrastructure and transition complexity, and the ability to maintain Minuteman III safely and reliably while Sentinel is delayed.
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