Missile Defense Agency - The MDA is what remains of President Reagan's Strategic Defense Initiative [SDI] and President Bush's scale back in 1991 to Global Protection Against Limited Strikes [GPALS] and is the segment of the armed forces dedicated to testing all types of missile defense systems. The MDA is responsible both for any type of National Missile Defense system and for developing theater or other limited missile defense systems along with the services that use them.

MDA's links page contains several of these related service and joint service ballistic missile defense efforts.

United States Space Command - While US SpaceCom is not involved in shooting down ballistic missiles (yet), an essential component of any missile defense system will be Space support for monitoring ballistic missile launch and in the future calculating intercepts. Two US SpaceCom programs do this. Currently the Defense Support Program [DSP] tracks missile and rocket launches as well as looks for nuclear blasts. This aging system will most likely be replaced by the SBIRS Low and High Satellite Constellations, originally entitled "Brilliant Eyes," which can in addition to tracking launches on Earth, track and discriminate warheads' flights through space. The Federation of American Scientists, although hostile to missile defense, maintain generally fair and accurate information on the SBIRS/Brilliant Eyes System, found here.

U.S. Army Space and Missile Defense Command - The Army's branch of Space Command. Good information on the High Energy Laser, the Kwajalien Missile Test Range and other innovative programs.

Naval Theater Wide Ballistic Missile Defense - The U.S. Navy does not currently keep any one site devoted to covering the most promising near term solution to the ballistic missile threat and is limited by the ABM treaty from touting the capabilities of the Standard Missile or AEGIS platform. However there are some useful fact sheets and help files which we have linked for you.