Your question was what the costs would be. There are lots of different kinds of potential costs. There are financial costs, but there are also costs involved in both participating and not participating in terms of other things, like how much of our resources are put into that as opposed to something else, or how much influence we have over the actual decision-making within a missile tracking and response system.
I agree with George that we can't know until we actually have the conversation. There are a number of different unresolved questions surrounding BMD, so if somebody comes to the committee and says we should do it because if we do it we will get x, y, and z, and it will cost us these other things, they are making it up. Nobody knows exactly what would be the terms of that agreement until we actually negotiate.