So, the U.S. called what others did to Americans torture, but when the U.S. does it to others, it's not torture. It's enhanced interrogation techniques. Well, no matter what the neocons call it, it's torture.
There are those within the U.S. military and so-called intelligence who spent all their working days studying and experimenting with torture. That's been going on in a very serious way since WWII.
The U.S. hired literal Nazi experimenters and set them up with a great degree of autonomy and impunity. They conducted horrific experiments on people, especially children. They did radiation experiments on them. They drugged them. They abused them mentally, physically, and sexually.
This was all under the lame excuse that they had to know what evil the opposition was or is capable of doing. The lame excuse was national security. In order to save society, they had to lower themselves as far as they could imagine the opposition might also be capable of descending into Hell.
Of course, the Nazi-leaners, such as the Bush family, aren't really interested in the general society of the common people. They are interested in their own mundane, fleeting power, wealth, and control.
See: "China inspired interrogations at Guantánamo," by Scott Shane. The International Herald Tribune. Wednesday, July 2, 2008
The U.S. used the exact same chart "copied verbatim from a 1957 Air Force study of Chinese Communist techniques used during the Korean War to obtain confessions, many of them false, from American prisoners."