Richard Clarke has been one of America's foremost experts on counterterrorism measures for more than two decades. Here he tells the disturbing truth about the war on terror.
The bestselling author and filmmaker ("Fahrenheit 9/11") shares a slew of letters from U.S. soldiers in Iraq that he has received, which he feels obligated to publish. These letters provide a unique perspective on what it means to be a part of today's volunteer military.