None Left Behind

*"Help with the evacuation of Alpha Base, and lead the marines to the Pillar of Autumn"*

**None Left Behind** is the eleventh mission (tenth in a straight playthrough) of the Installation 04 Campaign in *Halo SPV3*. It is an original creation, made by the SPV3 Dev Team.

The mission was originally cut from the mod, but was added in the *SPV3.2* update in 2019, along with The Commander, The Commander: Evolved and the Lumoria campaign. It is listed as SPV3D25, also known as D25.

After the events of Keyes, the Master Chief pilots the stolen Banshee from the Truth and Reconciliation back to Alpha Base, after receiving a distress call from Avery Johnson.

## Overview & Background

The mission involves fighting through Covenant, Sentinel Enforcers and Flood to Alpha Base, where surviving Marines are trapped and under siege from the Flood. After assisting them, Cortana opens the bases main gates so that the Master Chief, along with the Marines, can escape to a Pelican in the spot where the Chief first landed on Halo. However, the mission is doomed to fail due to the overwhelming might of the Flood and the appearance of Sentinel Enforcers. Only the Chief and Cortana make it out of the valley.

Shiela Polaski, the pilot of Echo-205, is featured again, her second and final appearance in *SPV3*, as a guide for Chief and Cortana and adding exposition for the player.

## Gameplay Information

This mission reuses the level design of the second mission, Halo, except it is played in reverse. In juxtaposition of its counterpart level, None Left Behind is set at night, with a different skybox, and has gone from flourishing green meadows to a war torn landscape surrounded by forest fires that have filled the air with smoke and ash, making visibility poor.

Spec-Ops Covenant are mixed in among regular Covenant forces for this mission. The Blind Wolves that were in previous missions, make another appearance here, only this time, they have been infected by the Flood. They are armed with natural projectiles seen on the Ranged Pure Flood Forms in *Halo 3* and act as Carrier Forms, releasing Infection Forms when killed.

## Developer Information

This mission ties into the novel *Halo: First Strike*, which is also the same novel where Shiela Polaski first appeared.

One of the reasons behind the levels creation, other than to expand the story and tie it to other pieces of *Halo* media more vividly, was to showcase how adaptable and diverse the sandbox and level design can be. This was done by having the player fight enemies in areas that were not initially designed for such encounters, particularly the first area, which was purely a vehicle section in None Left Behind's sister mission, Halo.

Another unique aspect of this level is that it features a dedicated Wraith section, something never done before in *Halo*. The developers wanted to have combat that takes advantage of the Mortar Wraiths cannon, as it can be used to fire at enemies in certain position that other vehicles, like the Grizzly tank, would be unable to reach.

## Trivia

* A beta of None Left Behind was going to be released but was cancelled due to the SPV3 Dev Team working on project *Oddball*. The level has since been released as part of the *SPV3.2* update.
* During the final portion of the mission, the bird songs heard in the mission Halo can be heard, despite the environment indicating that there would be no birds there.
* None Left Behind and The Maw are the only levels where weapons with under mounted grenade launchers can be found in the field.
* This is the only time Sentinel Enforcers appear without any Sentinels.
* There is more Rocket Launcher Flood here than in any other level.
* The skybox and lighting in this mission are present in the Firefight map Rockslide when fighting the Flood.
* This mission, along with 343 Guilty Spark, are the only missions that feature Marine versus Flood combat.
* The mission features dialogue for Cortana and Avery Johnson that has been taken from other parts of the game, other games in the series and even unused lines that were never featured in any of the games before. The voice of Shiela Polaski was done with a voice actor specifically for use in *Halo SPV3*.
* Although the narrative of the level implies that all Marines are killed during the mission, it is actually possible to save some Marines, albeit not many, from the massacre at Alpha Base and from the final stand at the Pelican at the end of the level. However, the Marines at Alpha Base will not follow the player into the tunnels, and the Marines at the end will not board the Pelican and will be left behind, though the dialogue will still play out the same.
* Due to the Chief's escape on the Pelican at the end of None Left Behind, the intro cutscene of The Maw has been changed to show the Chief flying a Pelican, instead of a Banshee like the original *Halo CE*.

## Walkthrough

**None Left Behind** • The Commander • The Commander: Evolved • The Maw