SEEKING 'UNCONVENTIONAL THINKERS' Defense Secretary Robert M. Gates speaks to students at the Air War College and the Air Command and Staff College at Maxwell Air Force Base, Ala., April 21, 2008. Gates told the students, "An unconventional era of warfare requires unconventional thinkers." SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 475361-Q-AMS97-315.jpg Photo Gallery