Group,
While remnant fortifications could be used, these are mainly a matter of research for interested GMs.
I'm reminded of (I think) some wealthy industrialist in Poland living with his family in a castle near Krakow with a small security force. Not a warlord or anything like that, just surviving. So old castles can be used as fortifications by military units, refugees and other survivors.
The Twilight war didn't come out of nowhere, war broke out after years of hostilities and tensions. Therefore, shelters and depots like the one in Allegheny Uprising would be fairly common. There would not just be leftover Cold War bomb shelters and installations (in various states of rehabilitation) but newly-built ones if there was a crash program to enhance government and military survivability in case of nuclear attack.
Further, these hardened facilities (government/military communication centres, command posts, depots, etc.) not just in the CONUS but all throughout Europe in both NATO and PacWar territory.
Further, modern fortifications are not difficult to construct. They mostly require normal construction equipment and common materials that could easily be commandeered by the military/government. Now that mobile warfare has basically stopped, many cantonments and former cantonments might have permanent fortifications constructed. Anything from a series of isolated concrete bunkers and pill boxes to interlocking defensive positions to a full blown permanent fortress where none existed before the war. Again, these would litter Europe and North America.
Tony
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