For the Republic, Part 2

 is a quest in Fallout: New Vegas

Detailed walkthrough
After completing the first two quests, head to the Hoover Dam and talk to Moore. She will have you head to The Great Khans base in Red Rock Canyon. Head into the building with the marker and you will find the leader. Talk to him and you will learn that they have an alliance with Caesar's Legion. Your orders were to kill them if no alliance could be made so either go into V.A.T.S. mode and take out as many as you can or walk outside and speak you will be greeted by Regis who after talking with him will give you the quest, Oh My Papa. They are relatively weak so it will not be that hard. Walk out and fast travel to the dam and report to the Colonel. It might be possible to become allies with the Great Khans if you improve relations before this mission.

One way to have the Great Khans ally with NCR is to take out Papa Khan silently (with a silenced sniper rifle while sneaking, for instance, making sure that the Great Khans do not become hostile), and then talk to Regis about it. This was successfully done after finishing Oh My Papa, after selecting the second Speech option (which talks about how the Khans are ghosts and martyrs.) Verification is necessary for the different options.

She will inform you about the Omertas and send you to find out what is up. Talk to the secretary at the NCR Embassy and she will direct you to the Gommorrah's receptionist. From there go talk to Cachino and wait until he walks away. The easiest way now is to crouch, activate a Stealth Boy (Fallout: New Vegas), and pickpocket his journal from him. Confront him about it and find out the information needed. Head to Troike and the talk about Cachino and then lie to him. (This will cause a loss of karma) He talks about thermite and have him put it with the weapons. Exit the casino and re-enter and talk to Cachino. You find out that he got caught and told the bosses your name. Talk Cachino into killing them during the meeting. Follow him and you will be given a sawed-off shotgun. Whichever way suits you, make sure the bosses are dead.

The next part of the quest is very challenging. You are required to eliminate the Brotherhood of Steel. I suggest that you complete the quests for the Brotherhood first. When you are ready, head into the bunker and go towards Head Scribe Taggart. If your science is high enough hack the self-destruct computer. If your science is not high enough, you have to pickpocket the keys from the Elder, Head Scribe, and Head Paladin. Trigger the self-destruct and be ready for a fight. If you have enough Stealth boys you can sneak your way out. If not, prepare for a heavy fight against many Paladins, Scribes, and turrets. Whenever you exit the bunker, it explodes and you cannot get back in. Go to Moore to finish the quest.

Alternatively, you can play through the quest Still in the Dark. As long as you stay on good terms with the Brotherhood, and McNamara remains Elder, a truce can be signed between the Brotherhood and the NCR. Note, however, that doing this will reduce your reputation with the NCR.

Bugs

 * If you talk to Regis about his opinion on NCR the objective "Talk to colonel Moore about a great khans/NCR alliance" is added, however there is no speech option with Moore regarding this.


 * If you are working with Yes Man and do You'll Know It When It Happens quest before doing this one and choose to bring a truce between NCR and the Brotherhood it will bug out and you will not be able to complete this quest. When speaking with the Colonel she will ask if the President is safe and you will have no dialogue choices to complete the quest even though you already did it.

If you already killed Cachino, this quest is not completeable.

1. Enter console (press ~) 2. Click on ranger grant (his name should appear top center screen, else you have selected something else) 3. Type "disable" "enable" (no quotation marks. You might have to repeat this, first time it was instant second time twice)
 * If when order to report to ranger Grant all he says: "We've got a lot to do to prepare for the Presidents visit and not much time." And the only talk option is Bye, follow these steps:


 * If you finish the quest How Little We Know before talking to Liza O'Malley the quest will be stuck as you no longer have any dialouge options to continue the quest with Liza O'malley. You can hack her computer in order to find out you can get information from the receptionist at Gomorrah but the same thing will happen and you will not be able to continue the quest as the receptionist will have no dialouge options for you.