At the risk of what some of these self-regarding leaders might consider lese majeste, I'll say that I'm pretty skeptical of these kinds of orders, which should really only apply to people above a certain pay grade, who have extremely sensitive information and whose capture might lead to the loss of tens of thousands of lives. I have in mind people like Ike himself.
I get what you are trying to say.
There was no expectation to take the pill (take your own life).
None, regardless of religious affiliation.
About the 80’s. . .post-Vietnam the code of conduct was revised to allow you to resist to the best of your ability. . .that is all. Too many guys suffered horribly during Vietnam as they resisted to the point of death or crippling. The US changed the code so that honorable men would not be placed in that situation, to allow them to walk the resistance path but yet, not die and if broken, not be considered a failure. You were trained to resist until you could resist no more.
No one was expected to die.
Even in the 1980s there were units that felt that some missions might call for it, for instance certain deep penetration LRS operations during the Cold War could call for it if the mission was important enough, such as a last ditch eyes on mission to determine if NATO needed to go nuclear.
It was a constant subject of discussion of what to do with a team member if he couldn’t be left behind alive and the mission had to be completed regardless of the cost.
Another constant subject of the two that dominated discussions in units like that, is what do you do if a cute little East German child stumbles across your team and the mission is just beginning, and must be completed (which is normally the case if you are already 300 miles inside the Soviet Union knowing that the GRU and KGB has hunter/killer teams that look for people like you and Army command or even the President is waiting for your information).
Exposure kills the mission and the team, a team member being taken alive kills the mission and the team because he will be turned over to professionals who need the information he has to immediately kill the team and their mission, it probably wouldn’t be a long term imprisonment that he is facing, but a concentrated effort of interrogation focused on information of immediate need and urgency, it is doubtful that POW rules would apply in such a case.