Wes Rumbaugh - Why Is Missile Defense More Than ‘Hitting a Bullet with a Bullet’?

The recent conflict in the Middle East has brought global attention to the use of advanced missile defense systems in the region. Israel’s system is known commonly as the “Iron Dome” and uses this kind of technology to protect itself against rocket fire launched from neighboring countries. The US is also providing support in the missile defense system. Even with American support, what are the limitations of Israel’s iron dome, and what other military systems are available to intercept and shoot down long-range missiles?