The plane that served unknown army in late 1960 for answering unknown air Force request to building a air battle control for unknown army that capable reaching 40000ft/12km altitude when still detecting at least radius 150km nearby. The development began in 195x when saw the potential of an airliner into a something that capable to detect enemy's threat. After saw the Potential of Lockheed L-1049 shooting star. The air Force try to copying it but lack of knowledge of the plane. The result was instead of using 4 engines, the engineer put 6 of them since they thing the plane need to reach altitude faster than usual airliner (and also there weren't any engine that similiar to the l-1049 shooting star). The wingspan also wider for generate airlift bigger. When entering prototype stage, the airplane could reach 42000ft /13km above sea level (but the plane best altitude is between 30000ft/9km altitude), when having 350mph/560kmh. And could fly at least 180 hours of flight(need reference). Thanks to radar, the plane could detect up to radius170km in clear condition (meanwhile in the thunderstorm the radar only could detect in radius 100km. The plane entered operational stage in early 1960's and fully retired in late 1980 with over 50 of them ever built. After fully retired in 1980, lot of them turned into many things such as, airliner, cargo plane, and better AWACS.