Looking very cool, I know the map is early in development but you asked for comments so you got 'em:
If you get the opportunity I’d suggest re-colouring the pak gun skin so as it’s textured in the temperate style rather than the desert one.
It might be nice to break up some of the hills with some rocks (either brushes or models).
If you can it might be good to break from the old brick style of texture as it’s used quite a lot at the moment, using different types to theme different areas.
Add some puddle decal shaders to some areas if you can, because they look cool 
Some rickety wooden fences might also work quite well as a detail to the terrain, adding a bit of context.
Maybe add some vehicles models, road systems etc so that the environment has a used/lived in feel.
Finally…Reference…Reference…Reference, if you don’t have loads already collect a few photos that will help you add feature areas to certain zones. It gives the player something nice to look at but also acts as a landmark for a certain route or area.
All in all comming on nicely, I look forward to playing te final product.
-Fluffy_gIMp
P.S. The command map layout looks cool!