Stockdale on Stoicism 43

Prison life became a crazy mixture of an old regime and a new one.

The old was the political prison routine mainly for dissenters and domestic enemies of the state. It was designed and run by old-fashioned Third-World Communists of the Ho Chi Minh cut. It revolved around the idea of "repentance" for "crimes" of anti-social behavior. American prisoners, street criminals, and domestic political enemies of the state were all in the same prison. 

We never saw a "POW camp" like in the movies. The Communist jail was part psychiatric clinic and part reform school. North Vietnamese protocol called for making all their inmates demonstrate shame, bowing to all guards, heads low, never looking at the sky. It meant frequent sessions with your interrogator, if for no other reason than to check your attitude. And if judged "wrong," then you were maybe down the torture chute of confession of guilt, of apology, and then the inevitable payoff—the atonement. 

The new regime, superimposed on the above, was for Americans only. It was a propaganda factory, supervised by young, English-speaking, bureaucratic army officers with quotas to fill, quotas set by the political arm of the government: press interviews with visiting left-wing Americans, propaganda films to shoot (starring intimidated people they called "American Air Pirates"), and so on. 

—from James B. Stockdale, Master of My Fate: A Stoic Philosopher in a Hanoi Prison