An easy way to avoid this is to ignore Yes Man completely, therefore preventing him from giving you the quest before you actually want it. In this case, Colonel Moore will ask you to protect President Kimball, but Ranger Grant will not respond to any attempts to talk, therefore, The quest cannot be completed. If you get 'You'll Know When It Happens' from Yes Man before you get it from Colonel Moore, then you will be forced to play the rest of the game as a Wild Card rather than working for the NCR.

You cannot work for both Yes Man and Colonel Moore for this quest.

See You'll Know It When It Happens for more detail.

Lastly, ensure that President Aaron Kimball lives through his speech at Hoover Dam.

Telling McNamara that the NCR wants them destroyed will prompt him to offer Colonel Moore a truce, which she will accept.

To have them enter a treaty with the NCR, Still in the Dark must be completed and McNamara be Elder (having not been replaced by Hardin during the quest).

To destroy them, one can choose to kill every member conventionally hack Paladin Ramos' security terminal ( Science of 75 required) to set the bunker turrets to target Brotherhood members or get the three keycards from Elder McNamara, Head Paladin Hardin and Head Scribe Taggart to initiate the bunker's self-destruct sequence.

Handle the situation with the Brotherhood of Steel at Hidden Valley, either by destroying them or having them sign a treaty with the NCR.

House's control chamber by accessing using the terminal near the back of the penthouse: this can be done with a Science skill of 75 and hacking the terminal by using the Lucky 38 VIP keycard found in the H&H Tool Factory or Camp Golf or by using the Platinum Chip.

Go to the penthouse of the Lucky 38 and enter Mr.

This is done by completing How Little We Know.

Figure out what the Omertas are plotting.

Either kill all of the Great Khans in the canyon or enter an alliance with them by completing Oh My Papa.

Deal with the Great Khans at Red Rock Canyon.

Report to Colonel Cassandra Moore at Hoover Dam and inquire about assignments.

Colonel Cassandra Moore requires the Couriers assistance in cleaning up the region and eliminating some of the NCR's problems. Even though the Courier dealt with the issues the New California Republic had in Freeside, the Mojave is much bigger than that.

Fallout nv for the republic part 2