"... 4 phases, boost, ascent, mid-course and terminal, each corresponding to a different phase of the threat ballistic missile flight regime.... the geography of each defended area dictates the types of systems that can be employed... Alternatively activities are categorized in 5 "blocks". For example, block 4.0 is "Defend Allies and Deployed Forces in Europe from Limited Iranian Long-Range Threats and Expand Protection of U.S. Homeland". It includes the US missile defense complex in Poland to be constructed, and the European Mid-course Radar (EMR) currently located at the Ronald Reagan Ballistic Missile Defense Test Site at Kwajalein Atoll, to be modified and relocated to the Czech Republic.