Welcome to Halo Answers. What would you like to know?

Well, either you're talking about the Beta (where no achievements were available), or you've got a leaked copy. If you have a leaked copy, you can't get the achievement because the points system is different. When you connect to Live on the 14th, your points will be reduced considerably, and you will no longer have the Spartan Officer rank.

The other reason can be because the September update and effected all kinds of people and you have to become a lieutenant on a game mode and you'll get the achievement with the light-switch achievement.

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