Stop brahmin raids

You will need to talk with the man in metal armor with a shotgun in NCR and tell him you are looking for a job. He will refer you to Westin, which you can tell the gate guard. Talk to Westin, and he will refer you to his henchman about the Brahmin problems. Once you are there, just wait for a few minutes until the Deathclaws appear. At this point, if your Outdoors skill is high, you can follow the Deathclaws back to their lair. Then return to Westin, and tell him what you saw to collect your reward.