stoic creek
If you don't know what they are: https://en.wikipedia.org/wiki/Catacombs_of_Paris.
TLDR: they're miles and miles of underground tunnels filled to the brim with human remains. I think this would make a fucking SICK idea for a BBR map. Endless underground tunnels that are creepy, confined, close quarters, and - simply put - scary. The catacombs have also been used in war before, so you could have some leftover French Resistane and German structures underground.
I think there could be multiple levels to the catacombs (floors), places where you can blow a hole in the floor, wood structures you could blow up to cause rocks to fall down (maybe cave ins in some extreme spots).
Let us also pick up skulls and throw them at each other. Idk that just seems fun.
If you didn't want this to be like based on a real place, combine it with a medieval castle/dungeon setting too. Then you could add some funny traps and set dressing as well.
Would be infantry only ofc. Buuut if you went with the option of making it not a real place, you coooould have giant underground tunnels or something. Like maybe a modern underground road intersects with these ancient catacombs or something that tanks can drive on.
brazen nebula
frail kestrel
fading willow
open flare
wraith dragon