The Boeing Phantom Eye was a high altitude, long endurance (HALE) liquid hydrogen-powered[1] unmanned aerial vehicle developed by Boeing Phantom Works.[2] The aircraft was Boeing's proposal to meet the demand from the US military for unmanned drones designed to provide advanced intelligence and reconnaissance work, driven by the combat conditions in Afghanistan in particular.[3] In August 2016, the Phantom Eye demonstrator was disassembled for display at the Air Force Flight Test Museum.[4]