The Kings try their best to keep the peace in Freeside but recently, tensions with the NCR squatters has changed the neighborhood for the worse, and the Kings limited numbers only allow them to do so much about it.
After he "saves" the Courier from a group of Freeside thugs, he can be interrogated with an Intelligence check of 6, followed by a Barter check of 50. Alternatively, a Medicine check of 30 reveals that the thugs are only pretending to be dead. Even easier, the "dead" thugs can be attacked and they will run off.
Report to The King that Orris is a fraud.
Talk to Roy and Wayne at the Old Mormon Fort about their attackers to discover that off duty troopers are the culprits.
Pass the NCR citizenship test: the answers are "Tandi", "Shady Sands" and "the two-headed bear" in that order.
Defuse the situation between Pacer and the NCR, either by killing Kieran and the other troopers, or by putting down your weapons and telling the envoy it was all a misunderstanding, depending on previous dialogue with the King.
Return to the King and inform him of the NCR supply drops.
(Optional) Inform the King that the NCR previously sent an envoy to discuss distributing supplies to Freeside.
Head to the train station in northwest Freeside and try to negotiate with the NCR.
Return to the King and let him know the situation with the NCR has been defused.
There are two squatter camps the map markers point the Courier to, one behind the Old Mormon Fort and one near Freeside's east gate, where Santiago can be found. With the missionary in the latter one the citizenship test can be bypassed by taking a Speech check of 50, telling him a lie that the Courier surely is an NCR citizen who just moved in from California.
Behind the scenes
During the quest, when talking to Wayne, he will mention he heard someone say "Lou Tenant", Roy then says that he means "Lieutenant", then calls him "dumber than a mutant". This is easily a reference to Lou, from the first Fallout.
G.I. Blues is the name of a movie starring Elvis Presley. It is also the name of a song that is sung by Elvis Presley.
The victims you are sent to speak with at Mormon Fort are Roy, Wayne and Farris. Roy Wayne Farris is better known as WWF/WWE professional wrestler Honky Tonk Man, whose wrestling theme was that of an Elvis impersonator.
PCXbox 360 After hiring Orris, he just stands still pointing his gun instead of shooting the thugs. You can fix it by killing them yourself which will advance the quest, though after he runs off he can sometimes die mysteriously before making it back to Freeside's north entrance. This bug may be caused by pickpocketing Orris's ammunition, even though he will still have some in his gun. Reloading another save will also fix this bug.
PlayStation 3 After returning to the King to inform him the NCR sent a representative to speak with him the player may get stuck. Part of the dialog sequence has a King gang member run into the room. The King gang member will get stuck trying to run through The Kings dog. After waiting a couple minutes he eventually gets through and the dialog continues.
Xbox 360 When asked to investigate the presence of NCR soldiers in Freeside, if the player doesn't ask Julia Farkas about the NCR before talking to Elizabeth Kieran, you may encounter a bug when asked to back up Pacer in the shootout with the NCR, where Pacer simply runs continuously into a wall with no dialogue options available.