Where can I find the treeline texture used in dod_hill_classic? It is also used in the axis spawn in dod_escape. I cant find any wads that contain it.

You can find name of this texture using this method:
start map, type developer 2 (or 3 im not sure), and shoot the texture. Engine should show you the name of it.
If you still won't be able to find it PM me this name, I have tons of wads of my disk and it will take a minute or so to search them.

You will find it in the dod_escape.wad

This might help you get to the textures you want:
http://countermap.counter-strike.net/Nemesis/index.php?c=74#p74

i dont have a dod_escape.wad, or a flugplatz or charlie and others too. I just have about 8 official wads and like 8 custom aswell.

Use the extacter utility as mentioned in the link above to get the wads out of the steam DoD GCF files.

I don't use it myself but it should help you get the latest wad files.