Unidentified UNSC medal
From Halopedia, the Halo wiki
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The Unknown Medal
The Unknown UNSC Medal is a decoration/medal awarded to Soldiers, Navy personnel and Marines in the UNSC Defense Force. It is rumored to be similar in function to the Colonial Cross, one of the highest decorations in the UNSC. It may be a Human-Covenant War Campaign medal.
It has recently been seen in some of the Halo 3 Advertisements.
