After 40 years of service, Air Force Chief of Staff Gen. Mark A. Welsh III is retired by his son, U.S. Marine Corps 1st Lt. Matthew Welsh, during a 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-FH950-428.JPG