I feel that a two year service should be mandatory, because look at Israel each one of there citizens are required to join the military and then they keep the guns they use. Now they are one of the most threatening countries in the middle east.
If world war 3 happened it would most likely be between us and China. The war would take for ever for us to win (if we did) because the Chinese have like 2 billion people. But we would also have many allies so we would win eventually. So this U.S.A. owns deal with it China/North Korea.
First off it cant be any one from DC, so I'd have to go with the punisher because he's got military training. He has almost no morals so he'll kill just about every one. He has no family or girlfriend or wife he has to worry about protecting. And plus he has a skull on his shirt, he is basically the grim reaper with skin on him.