Spartan Officer

Spartan Officer is a Halo 3 Multiplayer Achievement. It is earned when the player gains 50 experience points in a certain playlist and a rank of at least Lieutenant on Xbox Live. This Achievement gives 25 Gamerpoints to the player.

It is represented by a gold plate with an eagle holding three black arrows and a black thunderbolt, with three pips behind it.

It unlocks the Rogue Helmet for multiplayer use.

Glitches
It is said by a few players that they got the achievement at the same time as the Vidmaster Challenge: Lightswitch Achievement, and it didn't go through. Others did not get the achievement when advancing to a Highest Skill of 10, skipping last Gunnery Sergeant ranks and going straight to Lieutenant, Grade 1.

If you have achieved the Spartan Officer Badge and haven't got the achievement, you can still obtain the achievement by getting a lieutenant rank in any of the new playlist-specific ranking systems.