That idea sounds good, but the high risk of back fire is possible. we've sent people to jail before that were innocent, so sending an innocent criminal to war is just as bad as sending WILLING citizens to war. Plus, if other countries realized that these soliders are nothing more than theives or murderers, they may convince them with bribery think about it. If you're a criminal, the country sent you to war b/c they're hoping you'll die. That may get those soliders scared and they will betray their country.
I know I would.