A UAV, such as Boeing's upcoming stealth Phantom Ray, will probably be the conveyance of choice, because it can fly into enemy territory without risking a pilot's life. This raises a challenge for powering the instrument, Schamiloglu says. Although a UAV's small engine could provide some power, it will take high-capacity batteries to produce the gigawatt microwave pulses. Torres will say that he expects a prototype to be ready for flight tests in 2012, during which his team will adjust the beam to ensure that it inflicts damage only on the target.