“Precipice of War” & “Rocket’s Red Glare” are Railroad Main Quests. If you complete these quests the Brotherhood of Steel’s presence in the Commonwealth will be effectively over.
0:33 PRECIPICE OF WAR: Defend the Railroad HQ. Secure the Catacombs and the Church. Eliminate the BoS forces from the Cambridge Police Station and acquire the Brotherhood Virtibird sitting on the roof.
11:39 ROCKETS’ RED GLARE: Fly to the Prydwen. Plant explosives on the Prydwen. Escape Prydwen. Get to a safe distance, trigger the explosives and watch the Prydwen go up like a candle.