Defense Science Board Task Force on Defense Strategies for Advanced Ballistic and Cruise Missile Threats [open pdf - 698KB]
"The study reviewed current and future ballistic and cruise missile threats and assessed the implications of those threats to the survivability of U.S. forward based critical assets. The study found that the survivability of those assets could be very problematic given recent increases in potential adversary ballistic and cruise missile inventories and capabilities, in combination with a continued U.S. trend to make its regional offense capabilities increasingly dependent on fewer and fewer forward based assets. The final report recommends a three-pronged strategy to mitigate this problem based on a combination of passive defense enhancements, active defense enhancements, and some offensive capabilities not easily targetable by regional cruise and ballistic missiles. Implementing that strategy entails an ongoing annual investment of about $2.5 billion."
Defense Technical Information Center (DTIC): http://www.dtic.mil/dtic/