RANDY GEORGE joined the US Army in 1988. It had overhauled itself after the trauma of Vietnam. It had written a new doctrine, known as AirLand Battle, to defeat the Soviet Union in a war in Europe. And a few years later it would smash the Iraqi army in the first Gulf war, a conflict in which General George, as he is today, served as a young lieutenant. He is now in charge of that same army, and wants to reinvent it for a new age—not once, but continuously.