Deterrence: The first phase system should be comprised of ground and space-based sensors and interceptor systems.

CENTERFORSECURITYPOLICY: Center for Security Policy | An Assessment Of Future Requirements For US Strategic Forces And Strategic Arms Control

For example, deterrence -- while more in the background -- will continue to be based primarily on the prospect of unacceptable damage from retaliation.

CENTERFORSECURITYPOLICY: Summary of the Center for Security Policy's High-l