Secretary of the Air Force Heather Wilson coins a member of the 18th Wing protocol office as a show of gratitude for their contribution during her visit 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 photo by Senior Airman Quay Drawdy)
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