mr. soufan. thank you so much for coming on. now, many people here may not know who you are, but they really should because you've got quite the impressive cv. you're a former special agent for the f.b.i. you served on the front lines against al qaeda as an interrogator and a counter terrorism operator. and you have a new book called "the black banners: the inside story of 9/11 and the war against al qaeda." what's a black banner? >> this is actually what al qaeda believe they are. the black banner is a saying from the prophet of islam, prophet muhammed. >> stephen: i know who that is. sounds like a good guy, yeah. >> it says that the black banners will come at the end of time for the final battle of armageddon, and bin laden made a lot of these people who joined him in al qaeda believe that they are part of this black banner myth that's going to come towards the end of time. >> stephen: so it's an apocalyptic vision. >> well, it just gives us how little we know about al qaeda as an organization after all these years fighting it