There is something alluring about the idea of a "Golden Dome": a single, encompassing shield that can render a nation like the United States untouchable. Missile defense systems have long made that psychological appeal that enough technology can be a security risk and neutralize all potential risks. Similar to Reagan's "Star Wars" initiative, the result is a cycle of ambition, technical constraints, and spiraling costs. The question is whether Trump's Golden Dome is a sincere military strategy or a political blunder wrapped in a security blanket.
Trump's recent "Golden Dome" proposal is a multilayered missile defense system intended to shield the U.S. from ballistic, hypersonic, cruise, and potentially space-launched missiles. The most controversial part of this proposal is thinking about missile defense from space because it would place interceptors in orbit. The idea is to technologically be at the cutting edge while expanding the strategic military scope of the United States.
There are a few reasons to question the proposal, one of them being technological feasibility. As the Cato Institute points out in its Golden Dome analysis, this proposal is based on Israel's Iron Dome. Israel only has to worry about covering 8,500 square miles, as opposed to the U.S.' 3.8 million square miles. Also, ballistic missiles are much more difficult to intercept than short-ranged missiles, which is noteworthy because the U.S. would be more likely to be attacked by long-range missiles.
Furthermore, this report from the American Physical Society details how defending a country even from a few ballistic missiles is a challenge due to timing and geometry limits, as well as the ability for a defense system to discriminate the warhead from the rest of the "threat cloud." Once a missile is launched, a defender only has minutes to track, detect, and intercept the missile. Even under highly simplified scenarios, reliability drops quickly as the number of missiles increases. The challenge is developing a system at scale.
Even if proponents were to bypass the physical limitations, there is the issue of the price tag. According to a recent report from the Congressional Budget Office (CBO), this system will cost $1.2 trillion over a 20-year period, an amount significantly higher than Trump's estimated $175 billion. In terms of composition, up to $540 billion of that $1.2 trillion is due to the deployment and operation of the space-based interceptors.
The price tag also begs the question about opportunity cost. A trillion-dollar-plus commitment to missile defense necessarily crowds out other investments, including conventional force readiness, cyber defense, or a call towards greater fiscal restraint from the government more generally. This goes beyond the actual price tag. It is a question of whether such a large investment is justifiable given other priorities.
Aside from the costs, a core issue that such a system might actually provoke adversaries to escalate their military behavior. As the Cato Institute argues, the U.S. upping its interception architecture could incentivize other countries to expand missile inventories, more sophisticated decoys, or systems that would be designed to saturate and overwhelm the U.S.' missile system.
We already have seen this escalatory spiral take place. The situation between the U.S. and the USSR became so destabilizing during the Cold War that they needed to create the Anti-Ballistic Missile Treaty of 1972. Similarly, MERV development and Reagan's Star Wars initiative also escalated tensions rather than de-escalating. History "dealt" with these issues through arms control agreements and strategic stabilization to counter the escalatory nature of enhanced defense systems.
The Golden Dome tries to soothe people by promising the promise that enough technology can help avoid all risk. However, such promises provide a false sense that we can avoid all risk, much like during the COVID pandemic. The truth is that the Golden Dome cannot override the physical limitations, the absurdly high costs, and the escalation dynamics. A golden dome may project strength, but projection is not the same thing as protection of the American people.
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