There's a prisoner revolt and you must help put it down
The gutter people are revolting! Many have broken free of they're cages after a massive rocket launcher strike killed the power a few minutes. Seems planned. The ragheads have killed some good men and taken they're weapons they are freeing others.
You move in with a troop of diehards. You limp as you walk. They fall on your team in numbers, many of them killed but they have guns too. You end up being dog piled after putting your last bullet into one's eye. They beat you to death.