343 Industries, developer of the Halo game series since 2011 after Bungie, has a surprise from the Military Science Fiction first-person shooter game to the real member of the United States military. A rare limited edition collectible challenge coin can be obtained along with Halo 5: Guardians game when bought in some Military Exchanges.

The coin is about double the size of a quarter and shows Spartan Locke and Master Chief facing each other on one side of the coin. The other side of the coin has a guardian and Halo 5: Guardians embossed at the top half and center, as well as the five military branches: Army, Air Force, Navy, Marines and Coast Guard on the lower half.

Halo 5: Guardians was released on Oct. 27 and along with it, several collectible items had been made available from themed controllers and consoles to special editions of the actual game, however, the special collectible coin is not available to just anyone. It cannot be preordered because it is a special treat for the U.S. Military. "Our U.S. retail team worked with the Army and Air Force Exchange Service on this," a spokesperson for Microsoft, owner of 343 Industries, said.

Just how rare is this coin? The collectible coin is only for Halo 5: Guardians game that were sold in military exchanges but not all exchanges were supplied with the coin.

Of course, there are other ways to acquire the coin if you are really interested in it. The coin is currently being sold on eBay with the average price ranging from $32 to $51, and the highest price so far at $125. The price is still going up as many interested buyers are still bidding. Then again, there's always the possibility of enlisting in the military.

Halo 5: Guardians is available on Xbox One and digital download.