Engineers need to fold the X-47B into a fluid human system without disrupting it.When a pilot approaches an aircraft carrier, he is entering one of the most complex and least forgiving environments on Earth. Operations occur at hundreds of miles an hour, with a variable number of pilots, planes and deck personnel working on a bucking, wind-blown carrier deck. After a pilot radios his intention to land, air-traffic controllers either clear him for approach or direct him into a holding pattern. They also supply the pilot with weather and deck conditions. On the approach, the pilot typically relies on the landing signal officer (LSO) to guide him using light signals and visual cues. The air boss, an officer in the primary flight control tower, or PriFly, oversees the operation as well. Seconds before touchdown, the LSO makes a final landing determination, waving off the pilot for another try if the glide slope or course looks risky.