CHAIRMAN TALKS CYBER Army Gen. Martin E. Dempsey, chairman of the Joint Chiefs of Staff, takes questions from the audience during a discussion on the military's role in cyberspace and the threat that cyberattacks pose at the Brookings Institution in Washington, D.C., June 27, 2013. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 257954-U-PCA69-061.jpg Photo Gallery