A missile defense system may be worth while I agree, but, what is going to stop a nuke from being sailed into a U.S. port by an enemy that silently hyjacks one (or more) civilian yaught(s) overseas or on the high seas? It is a must to curtail nuclear proliferation amoung non-friendly societies to us in order to help prevent such seemingly unthinkable acts. The big question is, how do we do that especially when it seems already to late in some cases? If this act should happen, where could (or would)we point the finger? Pretty scary stuff! It is impossible for the military and the Coast Guard to monitor every civilian yaught that sails in and out of foreign port isn't it? Smuggling such a device aboard other vessels seems at least as probable. Maybe it is just a matter of time, but lets hope not and lets not just sit on our laurels waiting.