Were you looking for Installation 05, also known as Delta Halo?

Delta Halo is an achievement in Halo 2 Vista and Halo: The Master Chief Collection. It can be obtained by beating the level Delta Halo, on Normal, Heroic, or Legendary.

The Halo 2 Vista achievement is worth 30 Gamerpoints and is represented by the helmet of an Orbital Drop Shock Trooper.


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