Convention showcases unmanned capabilities
An unmanned aircraft surveillance system is displayed during the Association for Unmanned Vehicle Systems International Unmanned Systems North America 2009 Convention Aug. 11 at the Washington, D.C., Convention Center. More than 5,000 people attended the four-day conference and exhibit to see the more than 320 unmanned aerial, maritime and ground systems on display. (Defense Department photo/Army Sgt. 1st Class Michael J. Carden)