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 ...

Army challenge coins are popular in the United States, and while you are now interested in collecting some, you may not yet know how it started. Curious? Just keep reading! Challenge coins were born ...

A jokester has used knowledge gleaned from mandatory online training to create a military challenge coin guaranteed to make Defense Department insiders LOL. An image of the coin, shaped like DOD’s ...

Defense Secretary Robert Gates hands a challenge coin bearing his name to a service member at a forward operating base in Kandahar province, Afghanistan, in 2011. Photo by Jason Reed/Getty Images ...