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 ...

WASHINGTON — Since Bill Clinton occupied the White House, commemorative medallions known as challenge coins have been stately symbols of the presidency coveted by the military, law-enforcement ...

Getting your Trinity Audio player ready... For two decades, the commander in chief has doled out distinguished-looking coins as personal mementos. Now, the presidential “challenge coin” has undergone ...

WASHINGTON — Since Bill Clinton occupied the White House, the commemorative medallions known as challenge coins have been stately symbols of the presidency coveted by the military, law enforcement ...