Chief Master Sgt. Brian Thomas, 319th Air Base Wing command chief (right), presents his chief coin alongside mentor and friend, (ret.) Chief Master Sgt. Calvin Markham, March 23, 2018, at Grand Forks Air Force Base, N.D. Markham gifted Thomas this coin when Thomas pinned on chief in 2013. (U.S. Air Force photo by Airman 1st Class Elijaih Tiggs)
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