What is an army challenge coin?
Could you elaborate on the concept of an "army challenge coin"? I'm particularly curious about its origins, significance, and role in military culture. I understand it's a type of coin, but what sets it apart from other coins? Is it a form of recognition? A tradition? And how does it come into play in the day-to-day lives of military personnel? Your insights would be greatly appreciated as I delve deeper into this fascinating aspect of military heritage.