Israeli success with the Iron Dome anti-rocket system illustrates the way in which tactics and technology go together in anti-missile warfare. The success of the system may also have considerable consequences in the continuing standoff between Israel and Iran. Iron Dome was conceived to counter the thousands of cheap unguided rockets that are available in both Gaza and Lebanon. This is much the same problem, albeit on a far smaller scale, that the United States faced during the Cold War when contemplating missile defense: The enemy had many warheads, and it seemed that even if it could not multiply them, it could add decoys that would exhaust the defense. Thus it was argued that for every dollar the enemy invested in offense (including decoys), the defense would have to invest several times as much.
World Naval Developments - Under the Dome
By Norman Friedman