US missile defense shifts strategic focus to space-based systems

The debate over U.S. missile defense is increasingly focused on space, as defense experts argue that stopping threats in the first moments after launch could determine whether the country will be protected against the expanding arsenals of Russia and China.

The United States can no longer rely primarily on deterrence and retaliation to protect the country from missile attacks, former top defense officials said in a policy debate nearly a year after the “Golden Dome” homeland defense initiative was launched.

“I think geography is no longer a shield,” said former Undersecretary of the Air Force Karl Bingen. C-SPAN panel Friday. “There are different types of threats that can reach the homeland.”

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The Golden Dome initiative stems from a January 2025 executive order signed by President Donald Trump that instructed the Pentagon to accelerate the development of next-generation homeland missile defense architecture. The order calls for existing ground-based interceptors to be integrated with advanced tracking networks, new space-based sensors, and potentially space-based interceptors that can detect and defeat ballistic, cruise, and hypersonic missile threats early in flight.

Administration officials framed the effort as a response to the rapid modernization of Russia and China.

Russia has fielded new intercontinental ballistic missiles and hypersonic glide vehicles designed to penetrate missile defenses, while China has expanded its nuclear arsenal and built hundreds of new missile silos in recent years.

Both countries have invested heavily in maneuverable reentry vehicles and countermeasures aimed at complicating U.S. intervention efforts.

Early interception of missiles

Supporters of a stronger space layer argue that intercepting a missile early in flight (before deploying warheads or countermeasures) simplifies the defensive fight and reduces the burden on systems closer to U.S. territory.

“It gives us the ability to neutralize threats before they emerge here at home,” said missile defense expert Thomas Karako, referring to space-assisted capabilities that could track threats and potentially stop them earlier in their orbits.

Karako said there was a “compelling case” for space-based interceptors “not just against non-nuclear attacks, but also against limited nuclear attacks,” and argued that raising the threshold for adversaries considering an attack would strengthen deterrence overall.

“If you raise the threshold for having sufficient capacity to make meaningful investments in adversaries, there is good in that,” he said.

The goal, the panelists emphasized, is not absolute protection against thousands of intercontinental ballistic missiles, but to increase the likelihood of defeating smaller or more limited attacks, including those that may involve large salvos or advanced countermeasures.

Threats are evolving

Former senior Pentagon official Melissa Dalton said the use of missiles and drones has become increasingly normalized in recent conflicts, lowering the perceived threshold for employment.

Drawing attention to the increasing frequency of missile and drone attacks, Dalton said, “They do not respect the borders.”

Bingen argued that the United States has historically relied on the threat of retaliation to deter attacks, but changing technologies and enemy capabilities require a broader approach.

“Americans would be surprised at how dependent we are on vulnerability and retaliation,” he said.

Space and integration challenges

While space-based missile defense once attracted doubt due to cost and technical hurdles, Karako said advances in commercial launch and satellite technology have changed the calculations of feasibility.

“This is not the Soviet Union of the 80s or 90s,” he said. “Technology has improved a lot.”

Still, experts agree that integration—connecting sensors, interceptors, and command and control systems at machine speed—may be the toughest challenge.

A representation of the proposed “Gold Dome” missile defense architecture would integrate ground-based interceptors with a space-based sensor layer and potentially interceptors to defend the U.S. homeland. (Lockheed Martin)

“We must remember that this is a layered defense system,” Bingen said. “We’re not asking the space layer to do everything.”

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Participants also emphasized that any major expansion of homeland missile defense would need bipartisan political support to endure across election cycles and shifting budget priorities.

“If you don’t convince people what this is about, it will never get built,” Karako said.

Concept art for the Golden Dome initiative shows a layered missile defense system designed to track and defeat ballistic, cruise and hypersonic threats, including those from space. (Lockheed Martin)

Officials have set an aggressive timeline for developing initial capabilities, including a three-year effort, but Golden Dome is still in early development, with most work focused on planning, prototypes and initial contracts. Significant technical hurdles and acquisition hurdles remain, especially for space-based interceptor layers, which defense officials acknowledge will take years to fully field.

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This effort signals a broader shift in the United States’ approach to homeland defense. Rather than relying primarily on mid-course interceptors and the threat of retaliation, Golden Dome is designed to push defenses earlier and into space in a missile’s flight to intercept threats before they can implement countermeasures or overwhelm existing systems.