Secretary of Defense Ashton Carter, Secretary of the Air Force Deborah Lee James, Chairman of the Joint Chiefs of Staff Gen. Joseph F. Dunford Jr., Air Force Chief of Staff Gen. Mark A. Welsh III and Welsh's son 1st Lt. Matthew Welsh, stand during Welsh's retirement ceremony at Joint Base Andrews, Md., June 24, 2016. Welsh has served as the 20th chief of staff since 2012. (U.S. Air Force photo/Tech. Sgt. Joshua L. DeMotts)

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Photo by: Joshua L. DeMotts, TSgt, USAF |  VIRIN: 160623-F-FH950-086.JPG