Members of the U.S. military have long had a tradition of giving or exchanging “challenge coins.” The medallions have no monetary value; they come in various shapes and sizes, but most are about the size of a silver dollar, and they carry the symbols and names of military units or commands. Members of those units carry them to give to others as tokens of esteem. (They are called challenge coins because they can be used to prove that you are a member of the unit; sometimes they are called “commander’s coins” when they’re given out by a senior officer.)
In my years as a professor at the Naval War College, I collected many such coins from military students and from organizati
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