I'm bored and don't have anything important to do right now so I'm going to list off some good tracks that in some way or fashion fit into the Wasteland setting. (The fun part is I get to listen to them while I form the list)
http://youtu.be/uyHzro50MCg HAVOK - "Covering Fire" Official Video
http://youtu.be/miZLob1Hi4I Battlecross - "Push Pull Destroy" Metal Blade Records
http://youtu.be/eWVrdFrpXHE Lamb of God - As the Palaces Burn
I really like the lyrics to this song.
"War will be born.
Rejoice, the age of the fall has begun
We'll dance as the palaces burn.
A shot gun blast into the face of deceit
You'll gain your just reward.
We'll not rest until the purge is complete
You will reap what you've sown.
My redemption lies in your demise.
In such a world as this does one dare to think for himself?
The paradox of power and peace will destroy itself"
http://youtu.be/eoUf1bbMTa8 TRIVIUM - Shattering The Skies Above [OFFICIAL HD] <--- gotta say I like their recording process!
http://youtu.be/DxyRoCGK2jk Combichrist - This Is My Rifle
That's all I could think of, I didn't want to throw in all the other stuff I posted before.

Thought I knew more post-apoc and combat themed songs. I'm sure I forgot more than I listed.
"They finally shoved you in the box they could never fit you in, an empty cell forever locked. So much for best intentions, but some will load the gun and some will hone the knife. Some will raise the fist as they recall your life."