NATIONAL DEFENSE UNIVERSITY U.S. Navy Adm. Mike Mullen, chairman of the Joint Chiefs of Staff, addresses service members enrolled at the National Defense University, on Fort Leslie J. McNair, Washington , D.C., April 22, 2008. SHARE IMAGE: Download Image: Full Size (0.05 MB) Photo By: VIRIN: 482210-J-HRY04-671.jpg Photo Gallery