Challenge coins are an armed forces tradition, bearing the insignia of whichever organisation is handing them out. They were created as a way for those in the service to prove their membership - which is thrown off a little when you start getting fictional versions of the things.
As reported by SegmentNext, those who buy Halo 5: Guardians on a base associated with the US Army, Navy, Marine Corps, Air Force or Coast Guard will get a limited edition challenge coin along with their box. "No honestly," you'll hear, "I am a Spartan-IV. I just got shrunk down from my usual 7-foot stature by all the time travel."
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