On Aug. 1, 2005, Lt. Gen. Keith Alexander reported for duty as the 16th director of the National Security Agency, the United States' largest intelligence organization. He seemed perfect for the job. Alexander was a decorated Army intelligence officer and a West Point graduate with master's degrees in systems technology and physics. He had run intelligence operations in combat and had held successive senior-level positions, most recently as the director of an Army intelligence organization and then as the service's overall chief of intelligence. He was both a soldier and a spy, and he had the heart of a tech geek. Many of his peers thought Alexander would make a perfect NSA director. But one prominent person thought otherwise: the prior occupant of that office.