Does Israel's Iron Dome actually work?
22 April 2013 Last updated at 06:03 BST
The new US Secretary of Defence Chuck Hagel is starting a tour of the Middle East.
He begins in Israel where the United States has just announced that is its planning to bring its investment in the Iron Dome anti-missile defence system to several hundred million dollars in the coming years.
Kevin Connolly has been taking a closer look at Iron Dome.