Army Gen. David H. Petraeus, commander of U.S. Central Command, far left, Navy Adm. Michael Mullen, chairman of the Joint Chiefs of Staff, Army Gen. Keith Alexander, commander of U.S. Cyber Command, center, Defense Secretary Robert M. Gates, and Air Force Gen. Kevin P. Chilton, commander of U.S. Strategic Command, take a photo in front of a display reading "Defending our Nation" during the activation ceremony of Cybercom on Fort Meade, Md., May 21, 2010. Army Gen. David H. Petraeus, commander of U.S. Central Command, far left, Navy Adm. Michael Mullen, chairman of the Joint Chiefs of Staff, Army Gen. Keith Alexander, commander of U.S. Cyber Command, center, Defense Secretary Robert M. Gates, and Air Force Gen. Kevin P. Chilton, commander of U.S. Strategic Command, take a photo in front of a display reading "Defending our Nation" during the activation ceremony of Cybercom on Fort Meade, Md., May 21, 2010. SHARE: Download: Full Size (5.42 MB) Tags: Photo Essays Credit: VIRIN: 281722-Q-OTD08-877.jpg Photo Gallery