It's not the same thing as jerking some schmoe off of the battlefield and sending him off to Egypt with a bag on his head to be tortured by sadistic bastards who are definitely planning to cause serious harm.
If waterboarding isn't torture then it should be perfectly acceptable to use it in US police stations to question suspects, even witnesses ("hey we're not really hurtin him!").
I think you both missed the part where I wrote that our techiques had to be used under narrow, specific, and monitored circumstances.
The argument "If waterboarding isn't torture then it should be perfectly acceptable to use it in US police stations to question suspects, even witnesses" makes the illogical argument that if something isn't torture, it's okay to do it all the time. But that sort of limited thinking obviously isn't true. The equivalent would be to say, "If life-in-prison is okay for the crime of murder, it should be okay for all crimes. After all, crime is crime."
But we all know that some crimes are worse than others, and we all know that the punishment should fit the crime. Therefore, the techniques used against those involved in committing mass murder should also fit the crime.
We already allow various levels of intrusion into people's personal spaces, depending on the circumstances. A policeman who reasonably believes that criminal activity is happening can "Terry Stop" you and frisk you if he has articuable reasons to think you have a weapon. However, he can't search you for evidence of a crime. If he arrests you, he can search you and take you into custody. If a jury convicts you, you can be put into prison. If you murdered someone, you can be put to death. Each more serious step has a more serious consequence. It's a spectrum of responses to a spectrum of problems.
Waterboarding, sleep deprivation, and the like are not run-of-the-mill interrogation techniques. Thus, capturing some schmoe on a battlefield or arresting someone for speeding doesn't warrant these more serious techniques. Some schmoe isn't likely to have the info we need, so using those techiniques against him wouldn't make us that much different from our enemies. However, I'm not aware of anyone on our side who advocates such indiscriminate use of these techniques. Instead, the emphasis is on interrogating those involved in committing mass murder who do warrant more serious interrogation because they're involved in more serious acts with more serious consequences.
By making these distinctions, applying the techniques in narrow categories of cases, using a limited number of specific techniques, and monitoring our application of them so as to prevent misapplication, we demonstrate how we are different from those who seek to kill every one of us.