Talk to the guard to be able to become an Initiate
From FOnline: 2238 Wiki
Visit a satellite base of the Brotherhood of Steel in NCR, Den, or San Francisco to apply for membership with the door guard. Membership is considered through high skills or by bringing 200 AP 5mm rounds.
Fulfilling any of these requirements gives the player the rank of Recruit, the lowest rank in the Brotherhood of Steel. Access is then granted to all three bunkers in towns.
Rewards
- Joining the Brotherhood of Steel faction (Access to the town bunkers). You are now a Brotherhood of Steel member !
- Access to the next quest in the BoS quest-line: Bring 10 Radscorpion Tails.