"Armored Prayer" by Steve Jablonsky. Listen and then try to tell me you don't feel like walking in heroic slow motion and giving an inspiring speech while tanks and soldiers file by with helicopters flying past. (If you DON'T, scroll down the videos on the side and watch "Gears of War 2 Prescott Speech." You will be so freaking inspired that you'll regret not having a chainsaw and some aliens to use it on. It is THAT inspiring.)