The only component of the planned air defense shield in place is the long-range, high-altitude Arrow interceptor missile, which has been deployed since 2000. It is designed to shoot down Iran's ballistic missiles.
The third layer, known as David's Sling, is meant to counter medium-range missiles. It's under development by Rafael and isn't expected to be fielded until next year."
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NATO Missile Defense for Europe
NATO has agreed to provide ballistic missile defense or BMD for all of Europe. This NATO BMD will protect NATO (European and American) military forces in Europe. It will also – for the very first time – protect the civilian population throughout Europe from ballistic missiles and weapons of mass destruction launched from the Middle East.
Much of this NATO missile defense for Europe – known as the European Phased Adaptive Approach – will actually be provided by the United States armed forces. This will include seaborne AEGIS missile defense on board US Navy ships in the Mediterranean, as well as land based radars and interceptor missiles.
This e-book describes how NATO missile defense for Europe will be organized and implemented.