Coins The history of the challenge coins dates back to World War II, when an American pilot was shot down and captured in Germany. His identity was proven and life saved when he revealed a bronze medallion, with his flying squadron emblem. (U.S. Air Force photo by Airman 1st Class Deana Heitzman/Released) SHARE: Download: Full Size (1.3 MB) Credit: Airman st Class Deana HeitzmanReleased VIRIN: 150324-F-FK724-204.JPG Photo Gallery