PRESIDENTIAL WELCOME Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, speaks to an audience at the National Defense University during an assumption of command ceremony on Fort McNair in Washington, D.C., July 12, 2012, to welcome Army Maj. Gen. Gregg F. Martin as NDU’s 14th president. SHARE IMAGE: Download Image: Full Size (0.07 MB) Photo By: VIRIN: 143700-U-FGP86-719.jpg Photo Gallery