Reveille

Reveille is a Brotherhood of Steel main quest in Fallout 4. It is initiated upon seeing the Prydwen flying above the Commonwealth after exiting Fort Hagen during the quest Reunions.

If the quest Fire Support has been completed before exiting Fort Hagen during Reunions, this quest will not start.

Detailed walkthrough
Head towards Boston Airport and speak to any member of the Brotherhood of Steel. They will direct the Sole Survivor to Paladin Danse at Cambridge Police Station. Upon arriving at the police station or simply tuning into military frequency AF95, the quest will complete.