Spartan Officer
From Halopedia, the Halo wiki
Spartan Officer
Spartan Officer is a Halo 3 Multiplayer Achievement. It is earned when the player advances to the rank of Lieutenant (70 won ranked or social matches and a skill level of at least 10) on Xbox Live. This Achievement gives 25 Gamerpoints to the player and unlocks the Rogue Armor Armor Permutation.
An easy way to get here is if you have 4 controllers, you sign them in on a doubles match, and then just play your own person ranked, and get all the achievements (not confirmed to work).
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