Challenge Coins are traditionally used as tokens of good fortune, to show solidarity within an organization, handed out to individuals as awards, or purchased in bulk to commemorate special occasions or fundraisers.
The CDC Old School Challenge Coin -CDC MEETS CDCR shows some the symbols of the California Department of Corrections
Outside Ring: "California Department of Corrections" "State Prison"
Center Picture: Star badge background, crossed rifles, and skull face with hat. "CDC Est. 1885"