World War II started in 1939 when Germany invaded Poland. Great Britain and France responded by declaring war on Germany. The war in Europe ended with Germany's surrender on May 7, 1945. The war in the Pacific ended when Japan surrendered on September 2, 1945.
I would consider them hypocrites because they were fighting for their religion, but they did not adhere to the religion themselves. One of the major rules of this religion was not to kill and yet they did.