Secretary of the Air Force Heather Wilson coins U.S. Air Force Master Sgt. Brian Harris, 18th Wing protocol NCO in charge, Feb. 2, 2018, at Kadena Air Base, Japan. Challenge coins are a military tradition in which a senior military leader or a member of a distinguished office acknowledges the awards, accomplishments or significant acts of a particular service member. (U.S. Air Force

- Image ID: M42F77

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