During the Vietnam era, the code for the behavior of a POW was to give the captors nothing but name, rank and serial number. Everything else was excluded. There was no elaborate and lengthly code of behavior.
And any information a POW might have had related to a mission or national security would have had a pretty short shelf life of usefulness.
Yep
The code of conduct was drafted after the Korean War as a result of US POW behavior. It was in effect during Vietnam and was taught at SERE school during that time. Former POWs who taught at the Navy school said that the code heloed them immeansly during captivity