“The breakthrough that nailed [al-Qaeda in Iraq leader Abu Musab al-] Zarqawi was the patient (noncoercive) interrogation of a Sunni insurgent who eventually told his American interrogators that the best way to find the al-Qaeda leader was by tracking his ‘spiritual advisor,’ a man who would change cars several times before meeting with Zarqawi and who would invariably use a blue car just before the meeting took place. That information was enough to track Zarqawi to a remote desert compound, where he was killed with two five-hundred-pound bombs dropped from an F-16 on June 7, 2006.”
– Peter Bergen, The Longest War, Page 269