SINCE 9/11, Secretary of Defense Donald Rumsfeld has repeatedly declared that the United States is in a new kind of war, one requiring new military forces to hunt down and capture or kill terrorists. In fact, for some years, the Department of Defense has gone to the trouble of selecting and training an array of Special Operations Forces, whose forte is precisely this. One president after another has invested resources to hone lethal "special mission units" for offensive--that is, preemptive--counterterrorism strikes, with the result that these units are the best of their kind in the world. While their activities are...
