Back in Your Own Backyard

 is a quest in Fallout: New Vegas.

Detailed walkthrough
To start the quest, talk to Ranger Milo in the NCR checkpoint southwest of Nelson.

There are two different ways to complete this quest: Killing all of the Legion Members and rescuing the hostages, or just killing the three hostages.

To rescue the hostages, kill all of the Legion and then release them from the telephone poles. They will run back to the rest of the squad on their own. After this you can return the quest to Ranger Milo. You can also dress yourself as a member of the Legion and then walk to Nelson. It's also possible to use the ridge on the west side of Nelson as a vantage point (preferably while sneaking) to eliminate Legion members.

If you kill the hostages you may not have to deal with the Legion members. After killing all three, return to Milo.

You may let your companions kill hostile Legion members to receive no Caesar's Legion Infamy, however completing this quest after talking to Milo DOES give Infamy with Caesar's Legion and NCR fame (even if you kill the hostages you get Infamy and Fame). The Infamy is not enough to take a character below Neutral if no other hits were taken, but Legion members will be hostile if not disguised.

Behind the scenes

 * This quest may be a reference to the famous song of the same name sung by Billie Holiday.

Bugs
After killing all Legion members and freeing the hostages, Milo may still react as though the quest were still in progress. Keep in mind, there are Recruit Legionaries stationed in guard towers spread around the outskirts of the town of Nelson, in such a manner that you might not even see them on your radar. Search in all directions around the town, because Milo will stay in the "active" position, until all legionaries, in, and around, are killed.