Just when you think you've heard the worst...

From the Wikipedia page on the Phoenix Project (and my view of the US government goes down much further, which I didn't think was possible):

Methods of torture used at the interrogation centers included:

"Rape, gang rape, rape using eels, snakes, or hard objects, and rape followed by murder; electric shock ('the Bell Telephone Hour') rendered by attaching wires to the genitals or other sensitive parts of the body, like the tongue; the 'water treatment'; the 'airplane' in which the prisoner's arms were tied behind the back, and the rope looped over a hook on the ceiling, suspending the prisoner in midair, after which he or she was beaten; beatings with rubber hoses and whips; the use of police dogs to maul prisoners."[15]

Military intelligence officer K. Milton Osborne witnessed the following use of torture:

"The use of the insertion of the 6-inch dowel into the canal of one of my detainee's ears, and the tapping through the brain until dead. The starvation to death (in a cage), of a Vietnamese woman who was suspected of being part of the local political education cadre in one of the local villages ... The use of electronic gear such as sealed telephones attached to ... both the women's vaginas and men's testicles [to] shock them into submission."[16]

According to one former CIA officer few of the detainees who were interrogated survivedmost of them were tortured to death, and those that survived the torture sessions were generally killed afterwards.[17] The torture was usually carried out by South Vietnamese with the CIA and special forces playing a supervisory role.[17]