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The Northrop Grumman X-47B is a demonstration unmanned combat air vehicle (UCAV) designed for carrier-based use. Developed by the American defense technology company Northrop Grumman, the X-47 project began as part of DARPA's J-UCAS program, and is now part of the United States Navy's UCAS-D (Unmanned Combat Air System Demonstration) program, which aims to create a carrier-based unmanned aircraft. It is intended that the Unmanned Carrier Launched Airborne Surveillance and Strike System (UCLASS) will enter service in 2019.