Boeing's new “next generation X-plane” that would eventually succeed the F-35 fighter jet is shown in this undated concept graphic handout photo provided by Boeing Co to Reuters on January 28, 2015. U.S. Deputy Defense Secretary Robert Work on Wednesday urged NATO allies to develop and make more innovative weapons, and said bold action was needed to stay ahead of rapid weapons development by China, Russia and other countries. (Photo by Reuters/Boeing)
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