Why did the Strategic Defense Initiative face major technical and financial obstacles?

The Strategic Defense Initiative (SDI), proposed in 1983, faced significant hurdles due to its extreme technical complexity and immense financial requirements.

Technical Obstacles
The program aimed to intercept intercontinental ballistic missiles using advanced, yet-to-be-developed technologies, including space- and earth-based laser battle stations and sophisticated sensor networks. Critics argued the system was unworkable, potentially easy to counter, and relied on scientific advancements that were not yet feasible. The project required an unprecedented level of precision to detect and destroy moving targets in various flight phases.12

Financial Obstacles
The initiative was described by critics as expensive beyond reckoning. Between its inception in 1983 and its conclusion in 1993, the program cost taxpayers approximately $33 billion. While Congress approved initial funding, it eventually limited future expenditures due to the program's high costs and ongoing debates regarding its military and political implications within the context of the arms race.312

Ultimately, the program's ambition to create a comprehensive defensive shield proved too costly and complex to achieve its original goals.3