i have a related question from jim hoagland. as you know the pentagon appears to be planning for how to use cyber capabilities with respect to enemy nuclear command-and-control as part of a new push for what is being done for full spectrum missile defense. there are many who see this as perhaps a useful approach. there are some who see this as possibly a the other edge of the sword here. could be a double-edged sword. it could create destablizing dynamics. not just with the u.s. but with other other countries. what thoughts do you have about what considerations our policy planners need to make, our decisionmakers need to make as cyberattack and defense issue intersect with the nuclear command-and-control? >> i said before. i will repeat it. i think we have the best cyber capability in the world. part of that cyber capability is an offensive cyber, sometimes the way to deal with an attack from cyber is to attack back. in some cases though, for example, command-and-control, for example, that doesn't make any sense. we have to be t