I think this map looks promising.

I have some issues, however, with the consistency of theme. It seems to me, from looking at the screenshots, that there is a certain clash of themes here, which makes the map feel akward. I've never actually been in a military base, but I would imagine that they would seem less 'civilian' than your map. I don't know if that makes sense. I imagine a military base in the desert would feel much larger, and possibly more covert. I would picture some large hangars, housing vehicles and planes, underground concrete bunkers, landing strips, helicopter landing points...etc. There's just not much here that screams 'military base' to me. Now I don't know what size map you are intending to build - it looks medium to smallish. If that is the case, you could potentially build lots of cool 'unreachable' geometry in the skybox, that supports the theme and makes the base feel much larger and more functional.

As far as the basic architecture - some of the buildings feel 'unnatural'. The second story buildings feel too narrow and odd - the white window texture just doesn't feel right, and makes the scale feel strange.

Those lamps also feel strange and very non-military.

This is what I would do if I were you. I would take the basic layout you have now, dig up as many reference pictures as you can from google images.

http://images.google.com/images?svnum=10&hl=en&lr=&q=military+buildings

Then, using references, pour on the details to really sell the military theme.. A makeover, plus some nice lighting, plus a good skybox could kick this map up 10 notches on the 'cool meter'.