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George C Marshall is often forgotten today, but he was the Chief of Staff of the US Army during World War II. He was appointed to that office on September 1st 1939 and held that job until World War II was over. He became Harry Truman's Secretary of State after World War II and is most famous for his Marshall Plan that helped to rebuild Western Europe after the war. He was awarded the Nobel Peace Prize for those efforts.
George C Marshall oversaw the first peace time conscription in US History and saw the growth of the US Army from the 19th largest army in the world in 1939 (behind Bulgaria) to the fourth largest army in September 1945. The US Army had more mobility and firepower, better communications, tactical nuclear weapons and logistics than the larger Chinese and Indian armies did in 1945. The Soviet Union had a substantially larger army in 1945, but in many ways, the US Army was better. Marshall did not want to fight the Soviets in 1945. He often made the statement that "Democracies do not fight seven year wars." He defeated the Axis powers and wanted to bring his army home.
A good book, that shows how much the US Army of World War II was a George Marshall production is "There's a War to be Won" by Geoffrey Perret.