Call to Arms Call to Arms is a Brotherhood of Steel main quest in " Fallout 4 " . Detailed walkthrough . Paladin Danse asks the Sole Survivor 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 . Once one has agreed to assist Danse , he will order Scribe Haylen and Knight Rhys back into the police station . Follow them into the police station , where Danse offers the option to " resupply yourself " i . e . grab everything good in sight . After optionally talking to Scribe Haylen or Knight Rhys , tell Danse that you ' re ready to head out . Follow Paladin Danse west to the abandoned ArcJet Systems building . Alternatively you can simply meet Danse at ArcJet Systems , but by doing so scripted encounters will likely be missed along the way , and along with them the opportunity for loot and XP . As Danse first reaches the river shore road , one will find a pile of ghoul and raider bodies which was not there before , along with two active frag mines . Then , a group of raiders will be found ambushing some traders under the railroad bridge : after the fireworks are over , the pack brahmin in particular usually contains excellent loot . Note that these bodies will all despawn as soon as the area is left , so the only chance to obtain this loot is during the trip to ArcJet . Further along , the Survivor may be attacked by various local dogs and insects before finally reaching the ArcJet building . After a chat about the transmitter and automated security , provide fire support for the Paladin . He is dismayed to discover the presence of Institute synths . Head into the lab analysis room . Here you have the option to : Hack ( Advanced ) 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 , and the two of you will now begin fighting a way through numerous synths . 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 server room 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 hack 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 , noting that waiting longer before frying the synths will result in a higher body count for subsequent looting . Check on Paladin Danse , who will prove stunned but unhurt by the rocket blast , 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 . Outside , Danse will reward you with Righteous Authority and offer you the chance to join the Brotherhood . Whether you join or not at this time , he will subsequently be found back at the Cambridge Police Station , where additional quests can be obtained from him , Haylen , and Rhys if you do choose to join .