Secretary of Defense Robert M. Gates speaks at Duke University. Secretary of Defense Robert M. Gates speaks at Duke University, N.C., to ROTC Cadets from Duke University, University of North Carolina, North Carolina Sate and North Carolina Central University on Sept. 29, 2010. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 008184-C-PNF42-678.jpg Photo Gallery