Unmanned aircraft accomplishes first ever ‘touch-and -go’ aboard aircraft carrier CVN 77. The Navy's X-47B Unmanned Combat Air System Demonstrator (UCAS-D) has begun touch-and-go landing operations aboard the aircraft carrier USS George H.W. Bush following on board launching. For UCAS-D, this represents the most significant technology maturation of the program. Ship relative navigation and precision touchdown of the X-47B are critical technology elements for all future Unmanned Carrier Aviation (UCA) aircraft.