Upon completing the Main Quest: Reunions, the massive Brotherhood of Steel airship will pass by overhead just after players finish their business at Fort Hagen. Now that the Brotherhood has made their presence known, there are two ways players can go about acquainting themselves with this militant faction.
Note that the Brotherhood of Steel Quest: Reveille is only available to players who have not yet tuned into the Military Frequency AF95 radio signal, nor visited the Cambridge Police Station.
Investigate the Brotherhood of Steel Airship
As you reach the top of Fort Hagan, the impressive Brotherhood of Steel airship will soar across the sky, with several Vertibirds flying around its flanks. It is headed east, in the direction of the city. From here, you have the option to either travel to Boston Airport in the far east to investigate the airship, or go straight to Cambridge Police Station instead. If you want to go to the airport first, it is located on the eastern peninsula just before reaching Nordhagen Beach. For the quicker route straight to the police station, travel to Corvega Assembly Plant and be prepared to tune into Military Frequency AF95 on your Pip-Boy radio.
Upon arriving at the airport, speak with one of the Brotherhood soldiers. Inquire about the airship, and the soldier will tell you to speak with Paladin Danse at the Cambridge Police Station for more information about joining the faction, as you must be at least a Knight to come aboard the Brotherhood airship.
Proceed to the Cambridge Police Station
Travel to the Cambridge Police Station, per the Brotherhood soldier's instructions. The police station is located near the center of the map just south of College Square. The Reveille quest concludes once you reach the police station.
Keep in mind that if you tend to explore the wasteland before progressing through the main story quests, you will likely stumble upon the Cambridge Police Station ahead of time. To locate the police station before completing the Main Quest: Reunions, check out our guide titled Fallout 4: Call to Arms - How to Join the Brotherhood of Steel Faction.
As you approach the police station, watch out for the Feral Ghouls that are scurrying about the area. You will notice a man dressed in a suit of Power Armor, attempting to fight off the Ghouls to protect his fellow soldiers. This is Paladin Danse, and he is the ticket into the Brotherhood of Steel faction. Speak with Danse after clearing up the Ghouls to learn more about the Brotherhood of Steel.
To proceed with this faction, continue on to the Brotherhood of Steel Quest: Fire Support & Call to Arms, or return to USGamer's Fallout 4: Walkthrough and Guide.