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EIELSON AIR FORCE BASE, Alaska -- Airman 1st Class Christopher Griffin, 354th Communication Squadron displays his challenge coins. The challenge coin started during World War I when an American lieutenant ordered solid-bronze medallions and gave it to the pilots in his squadron. (U.S. Air Force photo by Airman 1st Class Jonathan Snyder)




EIELSON AIR FORCE BASE, Alaska -- Airman 1st Class Christopher Griffin, 354th Communication Squadron displays his challenge coins. The challenge coin started during World War I when an American lieutenant ordered solid-bronze medallions and gave it to the pilots in his squadron. (U.S. Air Force photo by Airman 1st Class Jonathan Snyder)

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