Some of these guys took considerable trauma to their graves. My Uncle was on a couple of Pacific Islands, including Okinawa. He didn't really like talking about it that much. Now that I've seen some real footage, I understand why.
The footage of the mass suicide of people on the island is enough to give anyone the willies. I've now seen other footage of U.S. soldiers, in rainy, flooded, filthy foxholes. In other words up to your neck in mud and water, filled with bugs, dead animals and remains of men, both Allied and enemy. You didn't dare "get up" or you'd get shot.