Call to Arms

Call to Arms is a quest in Fallout 4.

Quick walkthrough

 * 1) Speak to Paladin Danse.
 * 2) Follow Paladin Danse to ArcJet Systems.
 * 3) Follow Paladin Danse once inside ArcJet Systems.
 * 4) Speak to Paladin Danse.
 * 5) Follow Paladin Danse.
 * 6) Find a way to open the door.
 * 7) Provide fire support for Paladin Danse.
 * 8) Follow Paladin Danse to the Arcjet engine core room.
 * 9) Restore auxiliary power to engine core.
 * 10) Proceed to the control room
 * 11) (Optional) Activate the engine core's rocket.
 * 12) Proceed to the control Room.
 * 13) Clear the control room.
 * 14) Exit Arcjet systems.
 * 15) Speak to Paladin Danse.

Detailed walkthrough
Paladin Danse asks you to follow him to ArcJet Systems where he hopes to get his hands on a deep range transmitter to repair the Brotherhood of Steel communications array. After optionally talking to Scribe Haylen or Knight Rhys, head west to the abandoned ArcJet Systems building (or you can simply follow Paladin Danse, as he will accompany you on this mission).

After a chat about the transmitter and automated security, provide fire support for the Paladin. He is dismayed to discover the presence of the Institute synths. Head into the lab analysis room.

Here you have the option to: Hack (Advance) into the lab control terminal or use the lab analyst's terminal to receive the lab control terminal password.

Use the lab control terminal to open the door. When you reach the second floor corridor just outside the CEO's office, you can fight through the turret-lined hallway with Paladin Danse, or head into the office nearby and use the terminal to disable them. Follow Paladin Danse to the elevator leading down to the ArcJet engine core.

Paladin Danse and you need to reach the top of the engine core in ArcJet Systems, but first you will have to search for a way to restore power to the access elevator. You can access the facilities terminal (Novice) and hacking it. Start the auxiliary generators before returning to help Paladin Danse with his synth problem.

Alternatively you can press the Engine Start button on the Engine Core panel and watch the synths fry. Check on Paladin Danse and then head to the elevator and ascend.

Battle to the control room and secure the Deep range Transmitter off the corpse of a synth then leave the facility via the control room elevator.

Bugs

 * After Paladin Danse notes that there are turrets up ahead, he might turn around and head back in the direction you came, eventually coming to a stop and not moving at all. To get the quest to progress, destroy the turrets, and Danse will resume heading in the direction he is supposed to.
 * If this quest is not completed before Reunions and The Prydwen shows up, it will trigger a glitch that not all Brotherhood Vertibirds and patrols will spawn correctly, making it rare the apparition of them.

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