Click here for a printable PDF version. The U.S. has developed and deployed a number of systems in an attempt to defend the U.S. homeland, troops and facilities abroad, and allies against ballistic missile attacks. The Ground-based Midcourse Defense (GMD) System, originally referred to as “National Missile Defense”,  is intended for defense of the U.S. … Continue reading Fact Sheet: An Introduction to Ballistic Missile Defense