This challenge coin is from the Third Battalion Second Marines, the so called "Betio Bastards".
Text on front: "THIRD BATTALION SECOND MARINES / BETIO BASTARDS / UNUS SUPRA"
Text on Back: "Al-Anbar Province / Iraq Feb-Sept 2005 / UNITED STATES MARINE CORPS / CAMP GANNON / CAMP AL-ASAD CAMP AL-QAIM"
Here are some good links to info about the 3rd Battalion 2nd Marines:
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