system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] Does the Brotherhood have the manpower to simultaneously occupy DC and Boston without relying on a local militia or swelling its ranks with a whole lot of rubbish recruits?

Question inspired by the ability to simultaneously become a Sentinel and a General. Logically, that turns the Minutemen into Brotherhood auxiliary militia, which actually sounds like a smart idea.
gpt
The BoS under Maxson made some important recruiting changes. Besides the "be born in the BoS" route, if a wastelander is young enough they can join or if a established BoS memeber (such as a Paladin) vouches for the recruit they can join. In just 10 years this policy has flooded the BoS with a lot of decently trained soldiers. The expedition to Boston has 500+ members iirc, which is already larger than the Mojave BoS before Operation: Sunburst and that's not including the forces left back in D.C.