The person I was referring to was suffering from the consequences of being trained to resist electric shocks, not waterboarding.
Potential long term physical effects of waterboarding: death (drowning, heart attack); broken bones and other serious injuries (victim struggles to escape death). Lung damage (water inhalation and repeated gagging reflex), brain damage (oxygen deficiency).
Psychological damage (PTSD, panic attacks, depression) can also manifest physically in disabling ways, some of them fatal (e.g. suicide, drug/alcohol abuse, lack of self-care).
What you describe as run of the mill interrogation (sleep deprivation, stress positions, white noise) is considered to be torture under the UN Convention Against Torture.
http://www.hrweb.org/legal/cat.html#Article 2.1
Waterboarding, also.
Is this a variation of the "We're better than the Taliban" argument? I don't get your point.
It's easy to spout stinky abstractions. Perhaps you could provide a link to where I defend mass murderers and another for my alleged wingeing.
The person wasn't a friend. I have no reasons to doubt what he said. The symptoms he experienced didn't manifest while he was in the service.
I don't get your point here, either. Are you saying that this character building can prevent physical after-effects and things like Post Traumatic Sress Disorder from developing, so therefore I can’t be telling the truth?
Many veterans experience disabling physical and psychological trauma-related symptoms for years after their service, sometimes for life. A militarily well-built character is no protection against such symptoms, whatever their genesis.

Do you think I’m a "random poster to a public forum" everywhere I go?
JihadJane is just a screen name and, coincidentally, a name sometimes given to the well-known US traitor, Jane Fonda.
I notice that you do not precede all your posts with “Are you sitting comfortably? ... Then I’ll begin”.