Call to Arms Main Story, Brotherhood of Steel Quest
This quest will be triggered or can be aquired when you complete Fire Support quest.
Related points of interest
Stages of "Call to Arms" quest
1. Speak to Paladin Danse
Paladin Danse has asked me to follow him to ArcJet Systems where we hope to get our hands on a Deep Range Transmitter to repair the Brotherhood of Steel communications array.
He is inside the Cambridge Police Station building.
2. Follow Paladin Danse
Follow Paladin Danse to ArcJet Systems and then talk to him or enter the building.
3. Follow Paladin Danse
Paladin Danse and I have arrived outside of ArcJet Systems. We should proceed inside to recover the Deep Range Transmitter.
5. Follow Paladin Danse
While exploring ArcJet Systems, Paladin Danse and I were dismayed to discover the presence of Institute Synths. We'll have to proceed with caution.
6. Find a way to open the door
Use advance-locked Lab Control Terminal to open the doors. If Nick Valentine is with you, then you can ask him to unlock the terminal for you.
7. Provide fire support for Paladin Danse
Kill all the synths and turrets.
9. Restore auxiliary power to Engine Core
Paladin Danse and I need to reach the top of the Engine Core in ArcJet Systems. I'll have to search for a way to restore power to the access elevator.
Use novice-locked Facilities Terminal to Start Auxiliary Generators.
There is a special weapon, Junk Jet on the table in the room with red button, and a fusion core generator in the next room.
10. Proceed to the Control Room
Kill all the synths and then use an elevator.
10.2. (Optional) Assess Paladin Danse's condition
13. Exit ArcJet Systems
I've found the Deep Range Transmitter. It's time for Paladin Danse and I to leave ArcJet Systems.
14. Speak to Paladin Danse
Speak to him outside the facility. As a reward, Paladin Danse will give you his weapon, Righteous Authority.
You can agree or refuse to join the Brotherhood of Steel.
15. Quest completed
I've accepted Paladin Danse's offer to join the Brotherhood of Steel.
Paladin Danse has asked me to join the Brotherhood of Steel, but I've refused.
Next / new quest is Semper Invicta (Main Story, Brotherhood of Steel).