U.S. Defense Secretary Robert M. Gates speaks to students of the Air War College and the Air Command and Staff College in Polifka Auditorium, Maxwell Air Force Base, Ala., April 21, 2008. U.S. Defense Secretary Robert M. Gates speaks to students of the Air War College and the Air Command and Staff College in Polifka Auditorium, Maxwell Air Force Base, Ala., April 21, 2008. SHARE: Download: Full Size (2.8 MB) Tags: photo essays Credit: VIRIN: 691106-M-RNG25-088.jpg Photo Gallery