Although I can see this technology used for military operations (as it would save the government on fuel, batteries, etc.) this technology could easily be sold to NASA for future probes on Mars.
(Globes Online) Israel Aerospace Industries Ltd. (IAI) will unveil a solar-powered unmanned aerial vehicle (UAV) at an aeronautical show tomorrow. The UAV has extended drawing on solar energy collected during the day for night operations.
Since this article was posted two days ago, the show actually happened yesterday. Aside from military and space, we may one day see this technology used on commercial airlines (as it would definitely help cut down on CO2 pollution, satisfying the global warming crowd).