It was the CAPTAIN"s orders, they had intended to toss the body overboard.
Some soldiers put a lot of value on respecting even enemy soldiers, some do not.
This is on the order of the medic on Iwo Jima who treated Japanese soldiers even as he was dealing with American soldiers horribly injured and dying.
My significant other's father was also a medic on Iwo Jima and absolutely hated any oriental for the rest of his life.