This week, Lt. Gen. Robert Rush, who is involved with the Guam Defense Systems, testified before the Senate about the projected costs for the missile defense systems, which could reach approximately $8 billion. This estimate includes expenses for sensors, launchers, and the command and control systems necessary for integration.
Interestingly, all these systems are either already available or are in advanced development stages. There’s no mention of any new technologies being factored in.
Sen. Angus King from Maine reacted to the $8 billion estimate, suggesting it was a mere backdrop against the broader U.S. context. He calculated that, if you apply similar metrics to cities in the U.S. relative to Guam’s population, the overall cost of the golden domes across the country could soar to around $6.2 trillion.
However, some argue that King’s approach might be an understatement, and a more thorough evaluation could push that figure to as high as $6.4 trillion.
It’s tough to say if any of these figures hold water. While trying to assess costs for Guam in relation to the entire U.S., we found that if we compared the size of the island to the mainland, rather than the number of cities needing protection, the ratio brought our estimate down to about $119 billion.
The current plan for the Golden Dome is expected to evolve by 2031, per a presidential order issued by Trump back in January. This directive not only seeks to upgrade existing features but emphasizes the importance of leveraging space-based technology.
The elements outlined in the executive order involve fast-tracking hypersonic and ballistic tracking sensors, along with developing a network of space-based interceptors and custodial layers for warfighter architectures.
These specific advancements are indeed in their infancy. The concepts of space-based defense initially surfaced during Reagan’s Strategic Defense Initiative, which inspired the Golden Dome. Yet, the funding associated with Trump’s plans appears to be well beyond that $119 billion mark.
After Reagan’s advocacy for a U.S. missile shield faced criticism, dubbed “Star Wars,” funds for the initiative ended up totaling $120 billion, which would roughly equate to about $235 billion today. There have been additional expenditures related to the program, including missile defense installations in Fort Greeley, Alaska, yet none have resulted in operational space-based missile defense systems.
Recently, the House Armed Services Committee allocated $24.7 billion in its defense package for 2025. Even at this sustained level, over 25 years—mirroring the duration of Reagan’s initiative—it accumulates to nearly $620 billion.
However, this budget is merely a starting point. Future phases are likely to require significantly more funding. Some analysts even anticipate that expenses could escalate to about $2.5 trillion.
The Golden Dome also brings about opportunity costs. Other defense initiatives may suffer from underfunding or be entirely cut unless the overall defense budget can achieve substantial yearly growth for over two decades. Historical patterns don’t suggest such consistent growth, particularly as administrations grapple with economic fluctuations.
If the budget doesn’t grow significantly, it could have adverse effects on competing defense programs. Notably, without a pending $150 billion settlement package—which still requires congressional approval—the next budget might reflect a slight downshift that would negatively impact other initiatives contending for defense funds.
The Strategic Defense Initiative experiment included ambitions for various space-based capabilities, yet none truly materialized. Although technology has indeed advanced since Reagan’s era, the efficacy of space-based missile defense remains unproven.
With the staggering financial implications and potential impacts on other defense programs, the Golden Dome initiative warrants thorough and ongoing congressional oversight in the years to come.
