From the Roman Legions to 10th Special Forces Group, military challenge coins go back much further in military history than you think.

Add Yahoo as a preferred source to see more of our stories on Google. The challenge coin of Brig. Gen. Lawrence Muennich, the Adjutant General of the Indiana National Guard. (Courtesy of ING) In just ...

On its face, a challenge coin is a small, custom-designed medallion that bears an organization’s insignia or emblem. They’re carried by the unit members to signify membership, honor achievements, ...