Peter Mansoor, author of "Baghdad at Sunrise: A Brigade Commander's War in Iraq." He was executive officer to Commanding General David Petraeus - and served as commander of the 1st Brigade Combat Team, 1st Armored Division. His book is a frank appraisal of what went right and what went wrong after the U.S. seized Baghdad in the spring of 2003. Mansoor also discusses what is necessary in order for the United States to be more successful and effective in any such future undertakings.