Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, addresses an audience during the Air Force Association's Air and Space Conference and Technology Exposition Sept 18, 2013, at National Harbor, Md. The conference is designed to bring

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Adm. James A. Winnefeld Jr., vice chairman of the Joint Chiefs of Staff, addresses an audience during the Air Force Association's Air and Space Conference and Technology Exposition Sept 18, 2013, at National Harbor, Md. The conference is designed to bring together the leaders, defense industry experts, academia and specialists from around the world to discuss the issues and challenges facing the United States and aerospace community today.

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