Are We ready for III World War?

How would this turn into a World War, World War III can only be fought by either the U.S. Russia or China, I would say that a conflict with Iran would be a new Persian Gulf War but that's it. And Yes we are ready you have to understand our Armed Forces have been fighting for over 8 years and are battle hardened, our combat leaders the NCO's especially have seen combat and know how to lead under combat. If we were to fight Iran we would be fighting a country who has not seen combat with another Nation since the Iran-Iraq war in the 80s.