Typically, challenge coins are around 1.5 to 2 inches in diameter ... toured military bases in Afghanistan before his impending retirement. Along the way, he shook hands with dozens of men ...

“The challenge coin is a great way to boost the entire ... deployments to end June 24-- one day shy of securing federal retirement and education benefits for troops. President Donald Trump ...

In a tradition going back generations, service members receive challenge coins over the course of their careers and, someday, maybe after they’ve taken their uniform off for the last time ...