Unity of Public Service Challenge CoinReviews
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Impugnatio Servire Et Tueri. The Challenge to Serve and Protect. Limited Edition.
Here is my favorite version of the history of the Challenge Coin. In WWI a particular Allied squadron all wore the same bronze medallion. Some pilots just carried it in their pockets like coins. One of them was shot down behind enemy lines and captured. He later escaped and was captured by his own allied forces. With no identification, he was going to be executed as a sabatuer, but one of the officers recognized his medallion. Since it saved his life, the squadron decided they should have their medallions or coins on them at all times. To enforce this, if someone issued a challenge to see your coin/medallion and you could not produce it, you had to buy them a drink. If you did have your coin, they had to buy you a drink.
This tradition has been carried from the military