CNN  —  Iran and Israel have been trading strikes since Friday, when Israel first struck Iranian military and nuclear targets. When tensions escalate in the Middle East, Israel turns once again to its extensive air defense system – which includes the Iron Dome, David’s Sling and the Arrow system, as well as the US military’s THAAD system – to protect its citizens from incoming air attacks at various ranges. The missile defense system is one of the most important tools in Israel’s arsenal and