Cyberwarfare is bad enough by itself, but it's especially dangerous when military drones are involved. The last thing you want is a hijacked UAV that can give away your position or, worse, fire on your own troops. To that end, the US Navy is asking private companies for help with developing technology that protects drones, missiles and other airborne weapons against hacks. Whoever has the best proposal will (hopefully) craft systems that not only prevent enemies from getting in, but bounce back quickly if the worst happens.