My friend Jose of Fun Elements made these for me as participation prizes for Huzzah!
challenge coins are produced by military units for members or special guests or others they wish to honor. There is a little custom associated with these Coins that your Fencing Frog Challenge coin may or may not be accepted for (from Wikipedia):
"The tradition of a challenge is the most common way to ensure that
members are carrying their unit's coin. The rules of a challenge are not
always formalized for a unit, and may vary between organizations. The
challenge only applies to those members that have been given a coin
formally by their unit. This may lead to some controversy when
challenges are initiated between members of different organizations and
is not recommended. The tradition of the coin challenge is meant to be a
source of morale in a unit, and forcing the challenge can cause a
The challenge, which can be made at any time, begins with the
challenger drawing his/her coin, and slapping or placing the coin on the
table or bar. In noisy environments, continuously rapping the challenge
coin on a surface may initiate the challenge. (Accidentally dropping a
challenge coin is considered to be a deliberate challenge to all
present.) 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.
While most holders of challenge coins usually carry them in their
pockets or in some other readily accessible place on their persons, most
versions of the rules permit a challenged person "a step and a reach"
(particularly useful if one is challenged in the shower, a tradition in
Variants of the rules include the following. If someone is able to
steal a challenge coin, everyone in the group must buy a drink for that
person. During a challenge, everyone in the group must buy a drink for
the holder of the highest-ranking[clarification needed] coin. Some units provide strict time limits to respond to a challenge."
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