Lt. Gen. (Dr.) Charles B. Green, Air Force surgeon general, speaks to a crowd at his retirement ceremony at Joint Base Anacostia-Bolling, District of Columbia, July 19, 2012. Green retired after 34 years of service. (U.S. Air Force photo/Jon Stock)

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Photo by: Jon Stock, U.S. Air Force |  VIRIN: 120712-F-XE708-003.JPG