Missile Defense: Fiscal Year 2020 Delivery and Testing Progressed, but Annual Goals Unmet, Report to Congressional Committees [open pdf - 3MB]
From the Highlights: "For over half a century, the Department of Defense has funded efforts to defend the U.S. from ballistic missile attacks. This effort consists of diverse and highly complex land-, sea-, and space-based systems and assets located across the globe. From 2002 through 2019, MDA [Missile Defense Agency]--the agency charged with developing, testing, integrating, and fielding this system of systems--received about $162.5 billion. The agency also requested about $45 billion from fiscal year 2020 through fiscal year 2024. In fiscal year 2020, MDA's mission broadened to include evolving threats beyond ballistic missiles such as defending against hypersonic missile attacks. With the inclusion of non-ballistic missile threats, the Ballistic Missile Defense System is in the process of transitioning to the Missile Defense System. Congress included a provision in statute that GAO [Government Accountability Office] annually assess and report on MDA's progress. This, our 18th annual review, addresses the progress MDA made in achieving fiscal year 2020 delivery and testing goals."
Government Accountability Office: https://www.gao.gov/