Sorry to disappoint you, little warmonger, but with all these Nuclear Weapons,
World War 3 would probably be a Nuclear War, and anyone who doesn't die in the fighting will die in a Nuclear Winter. And even if that's not what happens, many people would die, and buildings would be destroyed for no good reason. For example, imagine you're in New York City one day. You're in a building, and you're looking out a window at the Empire State Building. Then, all of a sudden, a giant rocket (Not Nuclear) crashes into it, blowing a huge hole in it. Two more hit it, and the explosions make it tip over, destroying many other buildings. Now, imagine many, many people were in those buildings, and you knew it. Wouldn't that be traumatic? Now imagine that you see an army with a bunch of tanks and soldiers marching down below, while
military aircraft fly overhead. None of them are from the United States. The soldiers start shooting regular citizens. Tanks blow up surrounding buildings. The aircraft are attacking buildings as well. Unlikely? If you said yes (Due to it being a War Crime or something like that), then imagine the attacking country is an evil dictatorship. They wouldn't care. Innocents would die, and it wouldn't help improve anyone except maybe crazy Vietnam veterans.