SOG challenge coins. Info and any stories?

[Christophe]

Gentlemen,

I have a SOG PUC coin and a CCN RT XXXXXX coin I received from a 1-0, together with a team pic, his yard bracelet and other items.
The items like the bracelet received a prominent place in my home.
The coins I always carry on me in my wallet. I see them as bringing good luck.
I do not show them off or anything, besides no one here in Belgium would have the slightest idea what they are or mean.
I´d like to hear your opinions on this (a civvy european carrying coins).
Are there other SOG coins in existence?(Each RT his own coin?)
Also, does any of you have some stories regarding (SOG) challenge coins?

Thank you.