Back in 2009, cybersecurity was just an exotic idea. To some, it still is just that, or it's an idea to push aside and take up later. Almost every day, we read about another company, another Government agency that's been electronically attacked by adversaries trying to cause economic damage or searching for sensitive information, and getting it. It's not a threat that we can address through a traditional military response, and it's not a threat that individual companies can handle through their normal risk mitigation practices. It's a threat that challenges our traditional notion of the public and private spheres. A cyber attack against a government agency or a defense contractor is an attack against our nation. An attack against a private company-say, a water company-is an attack against our nation. So is it with an attack on a private company that provides power or clean water to millions of Americans; an attack against any of these pieces, even though they might be privately operated, is an attack against our nation's critical infrastructure and, therefore, against us, as a nation.