I am a Viet-Nam Vet. USAF Avionics maintenance Staff Sargent and served three years in "South East Asia. " Our bases were always in some danger of being over-run and thus of our being captured. we studied the "Code of Conduct of the American Fighting Man" every couple of months we reviewed it. And as time went on attitude changed slightly to permit apparent collaboration if no actual and willful success by the Enemy was the result. For example if our picture was taken in a POW camp, we were to flip a middle finger with our smile to demonstrate the true feelings we had. For myself, if we were over-run,the Pilots had orders to shoot us as they took off in their planes, so we could not be tortured for the highly classified information we knew. Although I think the pilots wouldn't do that and we would join up with the company of Marines who defended our base and set off to the South. Away from the Enemy.