We Are Legion

We Are Legion is a quest in Fallout: New Vegas. This quest is one of a pair of mutually exclusive quests to resolve the battle between NCR forces stationed in Camp Forlorn Hope and Legion forces stationed in Nelson. Completing this quest prevents the completion of Restoring Hope, and thus prevents the NCR from reclaiming Nelson.

Quick walkthrough

 * Kill all NCR officers at Camp Forlorn Hope.
 * Report back to Dead Sea.

Because several of these officers are involved in the quest Restoring Hope, finishing this quest will cause Restoring Hope to fail. Other quests that begin in or involve Camp Forlorn Hope can be completed, as long as they're done before killing the officers for We Are Legion.

Detailed walkthrough
If you are not wanted by the NCR this one will be close to a simple hack and slash. You should be able to walk into the camp with no issue and begin in a strategic location: try to pick a place where your back is against the wall. There are a lot of NCR men with some MP and the dogs. They are all relatively easy to kill but if you pair them with the mission targets it may get messy, so it is recommended to take them on one at a time.

Quartermaster Mayes is the average joe of all those you have to kill. While he does not take a massive amount of damage, he does walk in amongst the rest of the NCR troopers meaning that if you go for him almost everyone will know and will become hostile. Alternatively you might be able to catch him sleeping at night; some of the others do not sleep!

Dr. Richards is among the easiest because he is alone in the medical clinic most of the time. If you go for him first you should be able to take him down with one shot and come out unnoticed. He sleeps in a tent down from the Medical Center.

Dealing with Tech Sergeant Reyes may represent more of a challenge as she has two guards and is in a small, open tent, meaning the fight will be at close quarters. Both her guards, like most of the ones outside of the tent, have caravan shotguns so try to keep some distance between them and the Courier. She is almost always sitting down and therefore does not partake in the fight until after a shot or two is fired. Be aware though that she is still the most dangerous of the three if she does manage to get up.

Major Polatli is the wanderer of the targets. He maybe inside with the Tech Sergeant but is usually outside by the power station near the communications tent. He is the other target that sleeps.

Below are some tactics that may help:
 * An interesting option is to wait for a random Legion raiding party to attack and use the distraction to get a good number of sneak kills. A good player can rack up five to ten before the NCR notices that it's "friendly fire".
 * Alternatively, characters with a decent Sneak skill can sneak attack all but Sergeant Reyes while they are sleeping. If done with a melee weapon while hidden, killing your targets will not cause the entire camp to turn hostile. The Mister Sandman perk works well for this as well.
 * If for whatever reason you are unable to catch one of your targets alone, reverse-pickpocketing C-4 is a good option. At the NCR blockade just up the road from Nelson there is a footlocker with 2 packs of C-4 and a detonator.
 * Wait until all the officers are asleep (except for Sergeant Reyes who doesn't sleep) and put mines by their tent entrances. At 06:00 when they wake up they will walk out of their tents into the mines and all die.

After the quest is finished, NCR soldiers will continue to respawn there despite the (likely) massacre of the camp. The soldiers that respawn here strangely have multiple NCR dogtags on their corpses which makes the camp a useful place to stock up on caps and Legion fame.

Bugs

 * Sometimes massacring the camp will only permanently eliminate the camp's named NPCs. Returning to the camp will result in being attacked by a group of NCR troopers. Each trooper in the camp also oddly enough has multiple NCR dogtags, which make it a useful spot to stock up on them.
 * Standing in the south-western most lookout 'tower', the space between the sandbags and the roof is an invisible wall, allowing the player to pop out through the entrance, open fire, then retreat behind said invisible wall. The NCR will perceive you are hiding in a room and will all run to the location and equip melee weapons, making the quest very easy.
 * Beginning this quest after having gone through every other dialogue option with Dead Sea may result in immediate quest failure, and endless Legion infamy gained.