Secretary Gates talks to cadets in Arnold Hall. Secretary of Defense Robert M. Gates talks to cadets in Arnold Hall during a visit to teach both Political Science and National Security classes as part of the Capstone Seminar at the Air Force Academy in Colorado Springs, Co., on March 4, 2011. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 039753-Q-QRW88-654.jpg Photo Gallery