Coins, these days they call them Challenge Coins, in my opinion this is not the correct wording from historical point of view. I can sum up all the history what is mentioned on Google, but what is the real story ? In what year would be the first COIN made and handed over ? What specific reason soldiers received coins ? Does someone have an official document where the coin is handed over to someone ? Are there specific Citations to hand over the coins ? So what is the historical and most probably correct story why they hand over coins ? Again i know the procedure now, handshake thanks to the receiver, sometimes from the heart, sometimes just because of... I'm looking for the historical background of a COIN.