The design is a flashback to the manned Lockheed XFV-1 concept from the early 1950s that also sported a tail-sitter configuration. However, Northrop has imparted an engine with a pure flying wing design to the original concept. DARPA is looking for an unmanned vehicle that is capable of operating from DDG-class ships or smaller while being able to carry a 272kg payload to a distance of 1,670km while also being able to land on a rolling deck in Sea State 5 conditions.