ICARUS is an acronym for “Inbound, Controlled, Air-Releasable, Unrecoverable Systems,” but it’s also the tragic subject of a Greek myth. As the story goes, the young Icarus and his father Daedalus escaped from a prison by building wings from wax and feathers. Shortly after, Icarus ignored his father's warnings and flew too close to the sun; his wings melted and he plummeted straight into the sea. The myth is both a cautionary tale and tragedy. In DARPA’s adaptation, that very meltability becomes a feature, as DARPA envisions drones who only need to make their flight once.