Scott Air Force Base, Ill. -- During a recent visit to the 932nd Airlift Wing, the Air Force Reserve Command, Command Chief Master Sgt. Ericka Kelly presented several of her prestigious challenge coins to top performers within the 932nd AW. The history of the challenge coin is uncertain, but what is certain is that they are considered an honored treasure and a symbol of military heritage. The first coins were used as a symbol of squadron unity, a marker of having survived a battle or campaign. For many in the military the challenge coin is used during leisure times to raise morale by challenging one another to see who doesn't have a coin. Anyone caught in a challenge without a coin buys a round of drinks for those that do have a coin. But if everyone has a challenge coin, the person that initiated the challenge buys the round. Today the challenge coin is given in ceremonies and used by non-military organizations and companies as tokens of thanks and respect. One of the most sought after and collectible challenge coins is the one give by the President of the United States of America, a very rare coin with the highest of honors.