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January 12, 2009November 18, 2013Loren B. Thompson, Ph.D

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Missile Defense: The Boost-Phase Advantage

January 12, 2009November 18, 2013Loren B. Thompson, Ph.D

Research Study

Ballistic missiles equipped with nuclear warheads and other mechanisms of mass destruction are the most potent weapons that America’s defenders face. The number of ballistic missiles in global arsenals has declined considerably since the end of the cold war, but the number of nations possessing such weapons has increased. At least nine countries today have both ballistic missiles and nuclear warheads, raising doubts about whether the traditional approach to deterrence can work over the long run.

Ballistic-missile defense has the potential to strengthen deterrence by discouraging smaller nuclear nations from acquiring or launching weapons of mass destruction. While current U.S. defensive efforts pose little danger to the deterrent capabilities of Russia and China, they could completely defeat attacks by North Korea or Iran. That is especially true if enemy missiles can be intercepted in the earliest and most vulnerable stage of their trajectory, known as boost phase.

Interception of ballistic missiles in boost phase or the “ascent phase” that immediately follows rocketmotor burnout enables defenders to destroy payloads before they separate into numerous, hard-to-track objects. This maximizes the effectiveness of any defensive system, thinning out or eliminating the threat faced by subsequent layers of defense.

The Missile Defense Agency currently is funding several boost-phase interception programs. The Kinetic Energy Interceptor (KEI) is a mobile, fast-reacting missile that can be quickly deployed worldwide for early interception of ballistic missiles. The Airborne Laser (ABL) is an aircraft-mounted beam weapon that can hit lofting missiles at the speed of light and will be demonstrated against a live target in 2009. The Network Centric Airborne Defense Element (NCADE) and Air Launched Hit-to-Kill (ALHTK) programs are less costly adaptations of existing weapons to the boost-phase interception mission.

This report was written by Dr. Loren Thompson of the Lexington Institute staff as part of the institute’s continuing inquiry into future military-technology requirements and options.

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