WashingtonThe Congressional Budget Office found Golden Dome requires 1,000 interceptors per incoming missile.
It scored the system at $1.2 trillion — 7 times the $175 billion White House estimate.
Space Force has contracted Anduril and General Dynamics on interceptors; the Pentagon requests $17.5 billion for fiscal 2027.
Sources: Responsible Statecraft
THE COST-EXCHANGE RATIO
Missile defense's fundamental problem is arithmetic: an interceptor must cost less than the missile it kills, or the defender bankrupts first. A Patriot PAC-3 costs roughly $4 million; an Iranian Shahed drone costs $20,000. Defenders are losing the math on every shot.
WHY 1,000 TO 1
Each interceptor has a single-digit kill probability against a maneuvering warhead. To achieve high confidence of a kill, defenders fire salvos — and decoys, MIRVs, and hypersonic glide vehicles multiply the targets each missile presents. CBO's 1,000-to-1 ratio assumes a saturated Russian or Chinese strike, not a North Korean one-off.
THE SDI PRECEDENT
Reagan announced the Strategic Defense Initiative in 1983 — 'Star Wars' — with space-based lasers and kinetic interceptors. By cancellation in 1993, $30 billion (1990s dollars) had been spent with no deployed system. The technical premise that proved hardest was the same one Golden Dome assumes: hitting a bullet with a bullet, at scale, in space.
WHY ESTIMATES DIVERGE 7×
Pentagon program estimates traditionally cost the procurement contract — interceptors, launchers, radars. CBO costs the full architecture over its life: development overruns, basing, sensors, command-and-control, sustainment, and replacement cycles. Major US weapons programs historically run 30–50% over initial estimates; CBO assumes the pattern continues.
THE ISRAELI EXCEPTION
Iron Dome works because it defends a small country against short-range rockets with predictable trajectories. Tamir interceptors cost ~$50,000 against Qassams that cost a few hundred dollars — the math is still bad, but politically tolerable at Israeli scale. Golden Dome proposes Iron Dome's logic across a continent against ICBMs, where every variable gets worse.
WHAT THIS BUYS
Even if Golden Dome works as advertised, it defends against missiles — not cruise missiles, not drones, not bombers, not cyber, not the suitcase. Strategic thinkers since Bernard Brodie have argued that against a peer nuclear adversary, deterrence by punishment is cheaper and more reliable than deterrence by denial. Golden Dome bets the opposite.