US GOLDEN DOME MISSILE SHIELD
US ‘Golden Dome’ Missile Shield could
cost $1.2 trillion over 20 years
WASHINGTON, May 19:
President Donald Trump’s futuristic “Golden Dome”, a US national missile defence system, will cost about USD 1.2 tn ( 882bn) and develop, deploy, and operate over two decades, according to a new report by the Congressional Budget Office (CBO).
The United States would need to deploy a constellation of 7,800 satellites costing USD 743 billion over 20 years to intercept a limited raid of 10 simultaneous missiles as part of a space-based layer of the proposed Golden Dome for America’s air defence system
The executive order calling for the creation of what was initially termed the “Iron Dome for America” noted that the threat of next-generation weapons has “become more intense and complex” over time, a potentially “catastrophic” scenario for the US.
The report said the proposed layered defence architecture, now being pursued by the Pentagon under the renamed “Golden Dome for America” initiative, would require massive investments in space-based interceptors, missile-tracking satellites, radar systems, and surface-based missile defence networks across the United States.
That document called for a system with three fundamental characteristics: Comprehensiveness. The ability to counter many types of threats, including “ballistic, hypersonic, advanced cruise missiles, and other next-generation aerial attacks.” Another is the capacity that calls for the ability to counter a potentially large number of missiles that could be launched by “peer, near-peer, and rogue adversaries.”
Another dimension is the coverage. The ability to cover the United States, including “its citizens and critical infrastructure,” with”capabilities postured to defeat a countervalue attack.”
The executive order also called for several specific elements that CBO included in its notional National Missile Defence (NMD) architecture: Space-based interceptors (SBIs) capable of intercepting a missile during its boost phase, when the missile’s rocket motor is still burning; Deployment of the Hypersonic and Ballistic TrackingSpace Sensor (HBTSS) satellite constellation, and Countervalue attack,” is a nuclear deterrence term for targeting an adversary’s population centers.
“Counterforce attack” refers to targeting an adversary’s military capabilities, particularly its nuclear forces. A system postured to defeat a countervalue attack aims to defend a large percentage of the population.
Hypersonic glide vehicles are weapons that are boosted by a rocket to speeds greater than five times the speed of sound. Two layers of surface-based defenses-an “underlayer” and a “terminal layer”-which provide multiple opportunities to engage offensive missiles as they fly to their targets and thus increase the cumulative probability of defeating the threat.
The nonpartisan budget watchdog estimated that acquisition costs alone would exceed USD 1 trillion, while annual operating expenses would average about USD 8.3 billion. The system’s most expensive component would be a space-based interceptor layer, accounting for roughly 70 per cent of acquisition costs and 60 per cent of total spending.
According to the report, the envisioned missile shield would be designed to defend the United States against ballistic missiles, hypersonic glide vehicles, cruise missiles, and other advanced aerial threats launched by regional adversaries such as North Korea or limited attacks from peer rivals, including Russia and China.
However, the CBO cautioned that even such an expansive shield would not be “impenetrable” and could still be overwhelmed by a full-scale missile assault from a major nuclear power.
“The probability of a successful engagement would depend on too many factors,” the report said, noting that “fully engage” does not mean “fully defeat.”
The proposed architecture analyzed by the CBO consists of four interceptor layers that include a space-based interceptor constellation, an upper wide-area surface defense layer,A lower wide-area surface defense layer, and 35 regional sector defense zones across the country.
The report estimated that the space-based interceptor constellation alone would require around 7,800 satellites in low-Earth orbit capable of intercepting up to 10 intercontinental ballistic missiles launched nearly simultaneously during their boost phase. That layer alone would cost roughly USD 743 billion over 20 years.
The upper surface layer would include three interceptor fields equipped with Ground-Based Interceptors and Next-Generation Interceptors, while the lower layer would consist of four Aegis Ashore facilities armed with SM-3 Block IIA interceptors.
The regional defence sectors would provide terminal defence against ballistic and hypersonic missiles as well as cruise missile threats.
The CBO report highlighted a major gap between its estimates and figures publicly cited by the Pentagon.
The Office of Golden Dome for America has projected that its “objective architecture” could be deployed for about USD 185 billion over the next decade, with the Trump administration seeking roughly USD 15 billion annually over the next five years through the Golden Dome for America Fund.
The CBO said the disparity suggests either that the Pentagon is pursuing a more limited system than the one envisioned in the executive order or that substantial portions of the funding may come from other defense accounts.
“If the space-based interceptors were deleted from CBO’s notional system, the 20-year cost would drop to USD 448 billion,” the report noted, though it added that such a move would no longer align with the executive order’s stated objectives.
The report warned that deploying such a large-scale missile defense network could trigger strategic consequences and fuel a new arms competition.
According to the CBO, regional adversaries may respond by expanding missile stockpiles or developing advanced countermeasures designed to penetrate US defenses.
Peer adversaries such as Russia and China could also increase their nuclear and conventional missile arsenals to ensure they retain the ability to overwhelm the system.
The report said the United States might then feel compelled to further expand its own missile defenses and long-range strike capabilities, potentially intensifying global strategic competition.
Despite the scale of the project, the CBO acknowledged major uncertainties surrounding deployment timelines, technological feasibility, industrial production capacity, and future cost growth, particularly for untested systems such as space-based interceptors.
(UNI)

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