Implementation of the European Phased Adaptive Approach
"...With the SM-3 IIB interceptor, Phase 4 would have provided an intercept capability against ICBMs launched at the U.S. homeland from the Middle East. But the SM-3 IIB program also experienced significant delays, in part due to the U.S. Congress underfunding this interceptor. So as you know, the SM-3 IIB interceptor will no longer be developed or procured. The United States will instead strengthen its homeland defense by procuring additional Ground Based Interceptors – GBIs- for deployment at our existing missile defense site in Fort Greely, Alaska...."
Reference: www.state.gov .