This explains the technique. This also explains why we shouldn't do it.
When I was in the Navy, it was called "training," not "torture." Has anyone heard of SERE training?
The arguments against torture generally run on three false premises:
1. Torture doesn't work. False. If it didn't work, people would not have resorted to it for thousands of years. Stalin used torture successfully to stay in power for decades.
2. If we do it to them, they'll do it to us. False. This argument presupposes that our enemies are run by basically decent people. First, why would we be at war with basically decent people? Wouldn't we negotiate with them instead? We tend to war with basically bad people who will torture us or saw off our heads. This has been true of our prisoners captured by Japan, Germany, Korea, Iraq, Al Qaeda. They're already doing it to us and have done it to us for a very long time.
3. If we do it, we're no better than them. False. Ask yourself: If a group of Marines encounters a group of insurgents, and the Marines fire first, are they acting just like the enemy and thus are no better than them? I don't think so. They torture indiscriminately. When we waterboard and the like, we do so to gain information that might save hundreds, thousands, or hundreds-of-thousands of lives. We should do so only under very narrow, specific, and monitored circumstances.