GN,
During the days of the Vietnam War, many pilots captured by the North Vietnamese had knowledge of very classified Nuclear Information and other information that would have been of much value to the North Vietnam, China, and the Soviets.
It was always a risk they could be convinced to disclose what they knew.
I don't suppose those who were so critical of Powers would have considered using their own Service issued Revolver to shoot themselves in the Head to prevent their deciding to talk while being tortured would they.