Library of Congress. Congressional Research Service.
Abstract
In recent years there has been a growing sense of urgency to develop and deploy effective missile defenses against a range of long and short range ballistic missile threats. Although many might believe this to be relative new to U.S. national security objectives, such interest been ongoing since the 1960s, and current technologies being investigated date to the early 1980s. This effort has been challenging technically and politically controversial. Some $100 billion has been spent since the mid-1980s. This report provides a brief overview of U.S. efforts to date