I imagine that as bad as the war in Europe must have been, it was nothing compared to fighting in the Pacific, with the unbearable heat, the jungle, and all the deadly critters that were around, much less the Japs themselves.
The late William Manchester was a Marine in the Pacific. He said it was a war unlike any other fought by the US. He said he, and all the Marines with him hated the Japanese. They’d fight while shaking with malaria and when they could barely stand from dysentery. He also said the Japanese hated them in equal measure.
A war where quarter was neither asked or given. A fight to the death. A fight until the last man standing was was the winner.