Installation 04 (map)

Installation 04 is a Firefight map included in Halo: Combat Evolved Anniversary for Halo: Reach. The level is based on the cliff edge section of the campaign level Halo from Halo: Combat Evolved. Friendly AI -- ODSTs -- will aid the player in both solo and cooperative play; this is the first time that friendly NPCs have appeared in a Firefight map.

Locations
The following are locations on the map that are so named on the player's heads-up display during gameplay:
 * Landslide
 * North Drop Zone
 * Field
 * Station 1
 * Station 1 Interior
 * East Drop Zone
 * Station 2
 * Station 2 Interior
 * Gateway
 * South Drop Zone
 * West Drop Zone
 * West Ramp
 * East Ramp
 * Upper Deck

Trivia

 * The idea of including friendly NPCs originated when Certain Affinity was developing the Defiant Map Pack. They had experimented with the idea of adding friendly AI units to Unearthed but did not have time to implement them into the final map.
 * Elite players in Firefight Versus are unable to perform assassination animations against the ODSTs; they can only perform the traditional one-hit kill from behind.
 * The design of the Forerunner Beacon found on this level is noticeably different from the one seen in the remastered campaign. Rather than have the beams of energy shoot out of the structure from underground, they are emitted by a large turbine-like structure which emits bursts of energy upon reaching high enough speeds.
 * Due to the fact that AI is almost never present at the same time as Man Cannons, the AI tend to hesitate before entering them.
 * At the part of the map where in the campaign level the marines are hiding, 343 Guilty Spark can be seen flying back and forth between the two doors. Oddly enough, he appears to have a Marathon symbol within his "eye" despite the fact that 343 Industries deliberately omitted this feature with Halo: Combat Evolved Anniversary ' s campaign. An explanation for this could be that Monitor model included in the level was simply imported from Halo: Reach's Forge in order to avoid having to increase the file sizes of the DLC rather than having to completely add another Monitor model to the files for the map packs since the version used in Anniversary was made specifically for the game and not for Halo: Reach.
 * In some cases, one may see a (non-functional) prompt to exchange weapons with Spark, who is shown as holding a Focus Rifle. This seems to be related to a Forge bug involving Monitors, desyncs, and Focus Rifle beams.
 * This is the only Firefight level to feature a Monitor.
 * Despite the fact that ODSTs are seen being deployed by Pelicans in previews for the level, Pelicans are practically never seen in-game. In addition, regardless of the settings made for the level, no more than two ODSTs are almost ever seen and are never actually replaced when killed.
 * The only times ODSTs are ever seen leaving the main structure is when they are pushed off or boarding a friendly vehicle. However, the ODSTs will almost never respond to the player or board vehicles.
 * When the difficulty is set to Easy, four ODSTs will spawn instead of two.
 * The radio set found on this level is indestructible.