Making a comeback to a battle field near you-
http://www.greenoptimistic.com/2011/08/01/hale-d-solar-aerial-vehicle/The U.S. Army and Lockheed Martin have developed the first-of-its kind unmanned solar-powered aerial vehicle. Dubbed the High Altitude Long Endurance-Demonstrator (HALE-D), the solar-powered sky cruiser has been successfully launched at 5:47 a.m. out of the Airdock in Akron, Ohio.
It was able to reach an altitude of about 32,000 feet on its first flight but its developers forward to having it go up to 60,000 feet.
