NRL's XFC UAS Achieves Flight Endurance Milestone

http://www.nrl.navy.mil/pressRelease.php?Y=2009&R=85-09r

The Naval Research Laboratory has completed a successful flight test of the fuel cell powered XFC (eXperimental Fuel Cell) unmanned aerial system (UAS). During the June 2 flight test, the XFC UAS was airborne for more than six hours. NRL's Chemistry and Tactical Electronic Warfare Divisions are developing the XFC UAS as an expendable, long endurance platform for Intelligence, Surveillance and Reconnaissance (ISR).