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 IMAGE: Download Image: Full Size (0.03 MB) Photo By: VIRIN: 039753-Q-QRW88-654.jpg Photo Gallery