The largest "Army" of World War 2 was the Allied Force sent on D-Day (Invasion of Normandy) and the other largest army was the Russian forces that went against the Nazis. Japan had a huge force too but a large majority of them were killed on the islands and in sunken ships.
big big big
japa n has no army.
700,000
230,000
650,000
4,300,000
1,400,000
100,000
10,000
5,600,000
260,000
8,500,000