How to unlock: Go to Combat Zone and clear it of gunners (M6,11)
This quest is minimalist, but you receive a reward for it. It does not appear in the journal. Go to Combat Zone. Both in front of the location, and inside, you encounter lots of gunners. When you walk inside, they do not attack you straight away, so if you like stealth kills, this is a perfect opportunity for you to use your skills.
Clear the location of all the gunners, thanks to which you receive caps from Tommy, the ghoul in the arena. At the same time, he entrusts you with Cait, your new companion. In the location, there is a lot of Pre-war money.
Rewards for completing the quest: around 100 caps.