Return to Sender

 is a quest in Fallout: New Vegas.

Detailed walkthrough

 * Speak with Sergeant Reyes at the Camp Forlorn Hope Command Tent to gain this quest.
 * Deliver the radio security upgrade codes to each of the ranger stations.
 * Upgrade Ranger Station Alpha.
 * Upgrade Ranger Station Bravo.
 * Upgrade Ranger Station Charlie. (Possible Bug, see Bugs Section below)
 * Upgrade Ranger Station Delta.
 * Upgrade Ranger Station Echo.
 * Upgrade Ranger Station Foxtrot.

After you're finished you're sent back out to several stations to double-check the intel reports. Then you must go to Camp Golf and confront Chief Hanlon about it. He can be found on the balcony above the entrance to House Resort during the day.
 * If you decide to turn him in, he commits suicide with his revolver and you get 500XP.
 * If you let Hanlon continue his plan without informing the NCR, he walks off and you get 500XP.
 * If you have killed Caesar, there is another dialog but it ends up about the same as keeping it a secret.

Your choice to turn in Hanlon or not doesn't affect the situation at the dam.

''Note: If Hanlon kills himself he drops his Ranger Sequoia revolver, a rather unique weapon that uses the .45-70 Gov't ammo. The weapon is in perfect condition. To obtain the weapon drag it to an unoccupied room or run in and grab it before the Ranger runs in to investigate the gun shot.''

Behind the scenes

 * "Return to Sender" is a 1962 rock and roll hit single by American singer Elvis Presley. The song was written by Winfield Scott and Otis Blackwell. It is about a man mailing a letter to his girlfriend after an argument.
 * If the Courier goes to Hanlon at night, he finds Hanlon going from bed to bed with various NCR soldiers.

Bugs
-Same Problem, Selecting quest and looking at map, there are no markers leading to Charlie if you have completed said part. waiting to see if it makes quest impossible though.
 * Sometimes you can turn the first part of the quest in without bringing the new codes to Ranger Station Foxtrot.
 * It is possible for Hanlon to become glitched so that he remains stationary and never goes out to the balcony. He will not enter dialogue with the character and the quest cannot be completed.  Sleeping, waiting and fast traveling are all unable to fix his lack of movement. Walking into him as if your trying to push him MAY work as it worked for me in this situation, but if not... Loading a save prior to entering the building can fix this. Also, you can, after realizing he is glitched, exit the building, then wait out in front (real-time waiting) until he comes out on the porch, then re-enter the building and proceed to the porch. I was able to fix this glitch by telling my companion to return to lucky 38 and before he could leave I recruited him to follow me again. Right after that Hanlon walked upstairs to the balcony.
 * Chief Hanlon may remain stationary in mid-air after his suicide.
 * After deciding to turn in Hanlon you are unable to inform Reyes or the Rangers because it does not come up as a conversation topic.
 * If you have already been to Ranger Station Charlie to discover the rangers dead for the sidequest for Ranger Andy in Novac, you will still be able to complete the quest