The X-47B is the world’s first autonomous warplane. From takeoff through landing, it flies with little or no direct control from human handlers. Although it is a prototype not intended for actual combat use—the Navy calls it a technology demonstrator—engineers designed it to slip into contested airspace, dodge antiaircraft defenses like cannons and surface-to-air missiles, and deliver strikes or perform reconnaissance. When it completes its mission early next year, the X-47B will be both the first tailless aircraft and the first unmanned one to ever land on a carrier. And it will mean that the Navy, armed with some future variant, will have the capability to order unmanned sorties from carrier groups anywhere in the world within hours of a clash.