Actually, JAB, don't be confused. The so called missle shield WILL NOT shield major U.S. Cities from attack. At least under a massive strike. It really is corporate welfare and an excuse to pour money into R&D (Which I would be OK with me if half it reached the commercial sector in a timely fashion). As for a rogue nation shooting a nuke at us, they don't have to. All they have to do is get it on airliner or Fed Ex it in. Osama Bin Laden has already proven you don't need missles to strike the U.S.
What I really want to know is what they are really trying to build this for. So far the excuses don't match the system. Perhaps one day we will get the truth, but I'm not holding my breath.