Marine Corps 1st Lt. Matthew Welsh speaks about his father, Air Force Chief of Staff Gen. Mark A. Welsh III, during his 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/Andy Morataya)

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Photo by: Andy Morataya, USAF |  VIRIN: 160624-F-JJ904-396.JPG