Final answer:
The Soviet Union suffered the most significant military losses among the Allied powers in World War II.
Step-by-step explanation:
During World War II, the Allied powers faced significant military losses, but the Soviet Union suffered the most significant losses. The Eastern Front, where the Soviets were primarily engaged against the German forces, witnessed brutal and large-scale battles that resulted in immense casualties on both sides. The Soviet Union lost over 20 million soldiers and civilians, making them the Allied power with the highest military losses.
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