The six times the system found it's carefully scripted target it only did so because operators knew to the millisecond the time of the targets launch and it's very specific trajectory. Putting your faith in a heavily funded weapons system that has not been shown to be reliable in real world situations takes away from an effort to improve other, possibly more effective and more accurate defense weapons. If the need for defensive weapons is needed at all. So far the North Koreans have not been able to launch anything with a range greater than a few hundred miles but the Bush administration cast them as a grave threat that required the spending of $50 Billion of your tax dollars 12 years ago. Bush, Cheney and Rumsfeld sure knew how to use fear to get access to Trillions of dollars didn't they?