One thing that's evident about President Donald Trump's proposal for the Golden Dome missile defense shield is that designing, deploying, and sustaining it will cost a lot of money, at least several hundred billion dollars, over the course of several decades.

Beyond that, it's really anyone's guess. That doesn't sit well with some lawmakers , but the Republican-controlled Congress committed $25 billion in July as a down payment for new missile-defense technologies.

The White House stated in May that Golden Dome will cost $175 billion over three years, but a new study from a center-right think tank concludes that it is simply not enough to develop the kind of multi-layer shield Trump described in a January executive order. It's also clear that it will take longer than three years to imp

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