The Coin Check
The tradition of a coin check is the most common way to ensure that members are properly carrying their coin. The coin check, which can be held at any time, begins with the challenger drawing his/her coin, holding it in the air, loudly announcing, “coin check” and/or dropping the coin on the table or bar. (Should the coin be accidentally dropped, a coin check is still initiated.) Everyone being challenged must immediately produce the coin for their organization and anyone failing to do so must buy a round of drinks for the challenger and everyone else who has their challenge coin. However, should everyone challenged be able to produce their coin, the challenger must buy a round of drinks for the group.
Challenge coins may not be attached to belt buckles or key rings and still be considered challenge coins, and they may not be defaced in any way (such as drilling a hole to attach to a lanyard). A generally safe place to carry a coin is in a pouch worn around the neck (like the pilot in the legend). Carrying a challenge coin in the wallet is problematic because the distinctive circular bulge identifies the individual as a military member—a serious security consideration in many places—and because it can loosely resemble a condom (and therefore open the individual up to jokes from friends).