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Defense Secretary Ash Carter and Marine Gen. Joseph F. Dunford, chairman of the Joint Chiefs of Staff, deliver remarks at the retirement ceremony for Air Force Chief of Staff Gen. Mark A. Welsh III at Andrews Air Force Base, Md. Welsh was commissioned as an Air Force officer in June 1976, and became chief of staff in August 2012. DoD Photo by Navy Petty Officer 2nd Class Dominique A. Pineiro

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