So when and how did the U.S. military get this good? The elements of swift victory in Gulf War II have been well laid-out: the agility and flexibility of our forces, the pinpoint accuracy of the bombs, the commanders' real-time view of the battlefield, the remarkable coordination among all branches of the armed services (Army, Navy, Air Force, Marines) and special operations. But these elements, and this degree of success, have not been seen in previous wars, not even in the first Gulf War 12 years ago. Three major changes have taken hold within the military since then—a new war-fighting...