Air Force Chief of Staff Gen. David L. Goldfein acknowledges congratulations after finishing the Air Force Half Marathon Sept. 21, 2019, at Wright-Patterson Air Force Base, Ohio. Goldfein’s shirt honored the Special Tactics Memorial March earlier this year that paid tribute to Staff Sgt. Dylan Elchin a Special Tactics combat controller who was killed in Afghanistan in 2018. His hat carried a Survival, Evasion, Resistance and Escape instructor logo that was given to him during a visit to Fairchild AFB, Wash. (U.S. Air Force photo by Scott Ash)