Secret orbital space drone! A derivative of the earlier Boeing X-40 Space Maneuver Vehicle it is the worlds smallest robotic, unmanned space plane. Currently (Sept 2014) on it's 3rd top secret 600+ day mission in orbit, it is launched atop an Atlas V rocket. It could be anything from a sensor platform to the prototype for a manned USAF Space Dominance Vehicle! (I prefer the latter). Hollowed out to reduce mass, some assembly is required.