Understand this.... Those soldiers were enjoying the way they treated those prisoners.... That is what was wrong about it.... Personal Enjoyment is sadistic, and not in anyway connected with what the military would term acceptable treatment of prisoners.

As far as defining torture, every country has interrogation techniques that would be deemed inhuman. Sometimes it is vital to extract information; the preferred and expected methods the west uses are psychological rather than physical. I cannot say the same for the way our troops are treated by our enemies. Beheading kidnapped noncombatants is a measure of the inhumanity they are capable of.