NASA's Global Hawk Unmanned Aircraft (IMAGE) NASA/Goddard Space Flight Center Caption The Global Hawk unmanned aircraft comes in for a landing at NASA's Wallops Flight Facility in Wallops Island, Va., on Sept. 7, 2012. Credit NASA Wallops Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.