After Whirlwind had successfully demonstrated the feasibility of a high-speed digital computer for real-time control in general and its successful application to tracking air targets, it became clear that only a machine like this could be the key to an effective solution of the air defense problem which had been described by EVERETT as follows:233

“The air-defense data-processing problem is one of nationwide data-handling capability: facilities for communication, filtering, storage, control, and display. A system is required that can maintain a complete, up-to-date picture of the air and ground situation over wide areas of the country; that can control modern weapons rapidly and accurately; and that can present filtered pictures of ...

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