As pilots in N.I. we were issued with a Browning 9mm and two full mags plus a piece of french chalk. We were told that in the event of a forced landing or other unscheduled event we should use the chalk to draw a line around the aircraft. If anyone threatened us we were to inform them that if they crossed the chalk line we would shoot. Not a good idea !
The ultimate Escape/Evasion/Resistance to interrogation training by UK military entities is undergone by the Special Forces. I supported one of their exercises in the 80s and it was truly barbaric.
Could say what I saw but then..........
NEO