Senior United States defence officials warned lawmakers on 28 April that the country faces an "unprecedented" missile threat environment, with existing homeland defences offering only limited protection against advanced weapons, including hypersonic and cruise missiles. The testimony, delivered before a Senate panel in Washington, came as officials pushed for congressional backing of the proposed Golden Dome missile defence programme — a layered shield projected to cost roughly $185 billion through the 2030s.

The Threat Assessment

Assistant Secretary Marc Berkowitz told the panel that US rivals are "expanding, diversifying and increasing the sophistication of their arsenals of missiles and aerial weapons," posing, in his words, "truly grave threats to our homeland, to the American population, to our critical infrastructures, and to our second strike capability." He acknowledged that the current system offers only "very limited capability" beyond defending against a small-scale intercontinental ballistic missile attack, and that the US presently has "no defence against hypersonic weapons or cruise missiles."

General Michael Guetlein was more direct: "Our nation's margin of safety has vanished," he said, adding that "the homeland is exposed and relatively undefended" against a new generation of threats that are "unprecedented in their speed, numbers and lethality."

What the Golden Dome Proposes

Guetlein described the programme as "a layered, integrated shield designed to defend the homeland against the full spectrum of advanced threats." The proposed system would integrate sensors and interceptors across land, sea, air and space, combining kinetic and non-kinetic responses. Officials said the architecture would also leverage artificial intelligence and next-generation processing to improve targeting and response times.

The goal, according to Guetlein, is to deliver an operational capability by 2028, supported by a near-term funding request of more than $17 billion. The full programme cost is estimated at approximately $185 billion through the 2030s.

Congressional Pushback on Cost and Oversight

Lawmakers raised pointed concerns over both the scale of expenditure and the proposed funding mechanism. Senator Angus King questioned the use of a reconciliation process outside the traditional appropriations route, calling it "a huge mistake" and warning that it reduces congressional oversight. King also pressed officials on whether the longstanding doctrine of nuclear deterrence remains sufficient in the current environment.

Berkowitz responded that today's strategic landscape is more complex than during the Cold War, noting the presence of "multiple nuclear armed rivals" with advanced missile capabilities. He argued that missile defence would complement deterrence, providing "both a sword and a shield" to strengthen security and protect civilians if deterrence fails.

Guam, Ukraine Lessons and Production Gaps

Officials described Guam as "an undisputable part of the homeland" and a critical hub in the Indo-Pacific. Lieutenant General Frank Lozano said the Guam defence system is progressing on schedule, with a projected cost of approximately $3.5 billion.

Military officials drew on lessons from recent conflicts in Ukraine and the Middle East, citing the growing complexity and volume of modern missile threats. Lieutenant General Heath Collins said the US has issued "hundreds of updates" to defence systems in response to real-time battlefield data. Officials also acknowledged challenges in scaling production and maintaining interceptor inventories, warning that sustained investment will be necessary to meet future demand.

With the Senate yet to approve the funding mechanism and cost estimates running into the hundreds of billions, the Golden Dome's path from proposal to operational shield will depend as much on political will as on technological readiness.