I guarantee you he has had all of that done. To be deployed in SF, 18 series mos, you are required to pass SERE Training, Survival Evasion Resistance Escape. During that course, at least when he would have gone through, he would have been put through everything you just mentioned, forcibly. He would have been sleep deprived, deprived of food and water, locked in a coffin sized box for hours, and yes water boarding while strapped to a table under the exact same procedures that the detainees were, as well asbeing punched, slapped, and placed in numerous uncomfortable and excruciatingly painful positions. The CIA got those procedures from the SERE Training manual.
I would suggest you refrain making comments about things for which you obviously possess absolutely no personal knowledge of.