国会预算办公室：2025年发射成本降低对先前天基助推段导弹防御估计的影响报告（英文版）

As you requested, this letter provides the Congressional Budget Office’s estimates of how recent declines in the costs of launch services would change previous estimates of the costs to deploy a constellation of spacebased interceptors (SBIs) designed to defeat one or two intercontinental ballistic missiles (ICBMs) fired at the United States by a regional adversary, such as North Korea. Those previous estimates appeared in studies published by CBO in 2004 and by the National Research Council