Sept. 11 was a turning point in America in innumerable ways. Foremost: For our national security, U.S. intelligence, military and law enforcement agencies had to find a way to work together. It was imperative that they put aside age-old competition for the good of the nation. In a new book, a veteran national security reporter tells how these agencies created a sophisticated, global security network spawned by 9/11. He argues that the nature of warfare has been forever changed. Diane talks with journalist and author James Kitfield about how a new style of U.S. security operations offers the best hope for defending the nation in an age of asymmetric warfare.