KEYNOTE SPEAKER Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, delivers the keynote speech to about 400 attendees of the 5th anniversary celebration for the Center for New American Security in Washington, D.C., Jan. 31, 2012. SHARE: Download: Full Size (0.04 MB) Credit: VIRIN: 026280-J-BIP79-226.jpg Photo Gallery