Cyber Guard Active duty, reserve and National Guard service members participate in the Cyber Guard and Cyber Flag exercises sponsored by U.S. Cyber Command. The exercises focused on developing coordinated state government, National Guard, commercial enterprise, Defense Department and interagency responses to significant cyberspace-enabled attacks on U.S. domestic critical infrastructure by hostile actors. Cybercom photo by Navy Chief Petty Officer Dennis J. Herring SHARE IMAGE: Download Image: Full Size (0.21 MB) Photo By: Navy Chief Petty Officer Dennis J. Herring VIRIN: 170705-D-ZZ999-707.JPG Photo Gallery