The era of single-vector threats is behind us. That was Aerial Defense 1.0, when defenses were designed for ballistic missiles tracked by radar and defeated by linear kill webs. Threats came one at a time and could be countered in sequence.

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Kevin Kelly is chairman and CEO of Arcfield, where he leads the company’s strategy and delivery of technology-differentiated solutions that protect the United States and its allies. With more than 30 years in the defense and intelligence industry, he...