A Final Plan for Esteban

 is a quest in Fallout: New Vegas.

Quick walkthrough
Retrieve the corpse of NCR Private Christina Morales her husband, located to the east of REPCONN Headquarters. His corpse is used by Fiends to lure in NCR troops, so take them out first, then grab the corpse and drag it to the troops, they're just down the way to the north of the place you found him.

There is no quest associated with this task; when accepted a note is added under the Misc section of the Pipboy's Data menu.

Detailed walkthrough
Just head south from Camp McCarran toward the map marker. Just north of the REPCONN Headquarters, you will be approached by an NCR Trooper who offers some advice about retrieving the corpse. From the Trooper's position, you should be able to snipe all of the Fiends off of the roof of the buildings surrounding the corpse (about 4 or 5 of them). Afterward, approach from the west (toward the REPCONN Headquarters, the open end of the U-shaped building layout surrounding the corpse). Even though the Troopers warned of traps, there are breat traps by the picnic tables and a rigged shotgun in a walkway between the two buildings.

You will need to carry the corpse back to the two NCR Troopers who you spoke with earlier. When you get close enough, a new note will be added, and you can drop the corpse. Return to Pvt. Morales in Camp McCarran and inform her that the task has been completed.

There does not seem to be a reward for this quest. After speaking with Pvt. Morales, she will thank you and offer to assist you in anything you need, but speaking with her again does nothing, and there is no reward in caps, items, Fame, skill points, or Karma. There may be a reward if you speak with her after a certain amount of time though (She gives you 50 caps. Dont know if that was changed in the patch, though. unconfirmed).

However, you could talk with Colonel James Hsu after the completion of this quest. He'll congratulate you and he'll give you a special key (need more details: I use the french version of the game, so I can't translate the name of this key. By the way, I can't find the stash Hsu refers to...).

Journal entries
"Private Morales has asked me to find and retrieve the corpse of her dead husband. His body is apparently being used as a lure to draw in NCR troops and slaughter them.  Better keep a look out for traps and snipers...

The body is just east of Repconn HQ and I should carry it to the troopers camped out on the north side of the railroad tracks."