I think the aliens know exactly where they are and they're being hearded south. Who knows for what sinister purpose but the Reservation theory floated here seems plausible. Somehow, keeping a few humans around must be pretty important to the aliens because they're willing to throw away some skitters and mechs to keep everything convincing. Charleston is a thousand miles away and I'm assuming NYC and DC are bombed out, although Philadelphia and Baltimore are probably like Boston, emptied out and supporting towers. Should be an interesting trip. I'd certainly head south instead of trying to rough a winter in the Catskills, although I will miss Boston.