Chesty Puller...his leadership helped sustain the Marines of his regiment on numerous occasions throughout the their Pacific Campaign against almost impossible odds. Daring, humble, fair, hard-nosed, and a no BS commander, his fearless demeaner and willingness to lead from the front produced results.
John Basilone...it was estimated that he killed up to 400 Japanese at Henderson Field alone, his single handed actions undoubtedly had a decisive role in defeating the Japanese on that night. Not to mention his Navy Cross he recieved from his actions on Iwo. Sadly, he died in the first week of the battle for Iwo Jima and IMHO, after reading his Navy Cross citation, I think he should have recieved another MOH.
Audie is always a solid choice, probably one of the most humble heroes one could ever ask for. It seems that as the war drug on for him, he just got more feasome and deadly. But probably one of the nicest guys you could ever meet.
Larry Thorne is also a great soldier. He became a legend fighting against the Russians for Finland, and then later joined the German Army so he could continue to fight. What's even more amazing is entrance into the American Army after the war, eventually becoming a Green Beret, but sadly, he dies in Vietnam.