Aircraft
UAVs bring their own set of stealth challenges
Four decades after the first truly stealthy air vehicles were secretly flown in the U.S., the technology has matured and proliferated.

Four decades after the first truly stealthy air vehicles were secretly flown in the U.S., the technology has matured and proliferated. Many countries could now design a stealthy, small unmanned aerial vehicle, but since uncompromised stealth capabilities bring penalties, developers and operators are still wrestling with multiple trade-offs.