Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, delivers the commencement address at Duke University in Durham, N.C., May 11, 2014. Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, delivers the commencement address at Duke University in Durham, N.C., May 11, 2014. SHARE: Download: Full Size (0.34 MB) Tags: Photo Essays Credit: VIRIN: 511207-F-CWZ15-584.jpg Photo Gallery