It is cyberspace and war in it about which I speak. On October 1, 2009, a general took charge of the new U.S. Cyber Command, a military organization with the mission to use information technology and the Internet as a weapon. Similar commands exist in Russia, China, and a score of other nations. These military and intelligence organizations are preparing the cyber battlefield with things called "logic bombs" and "trapdoors," placing virtual explosives in other countries in peacetime. Given the unique nature of cyber war, there may be incentives to go first. The most likely targets are civilian in nature. The speed at which thousands of targets can be hit, almost anywhere in the world, brings with it the prospect of highly volatile crises. The force that prevented nuclear war, deterrence, does not work well in cyber war. The entire phenomenon of cyber war is shrouded in such government secrecy that it makes the Cold War look like a time of openness and transparency. The biggest secret in the world about cyber war may be that at the very same time the U.S. prepares for offensive cyber war, it is continuing policies that make it impossible to defend the nation effectively from cyber attack.