Scott -- In regard to this matter, you wrote: "Executing captured commandos out of uniform is completely justified. You don't waltz into a foreign country with patriotic bullshit on your tongue and mayhem in your mind and expect that there not to be any consequences, even in wartime. When some German spies landed in the USA by U-Boat during the war they were executed, some only teenagers. It is a bit hypocritical to say that the same should not happen to Allied spies and saboteurs."
I was thinking of something different from executing armed marauders who weren't wearing a uniform when they were captured. I don't think those people qualify as prisoners of war. There's certainly a long history of that kind of person being executed by enemy forces.
Instead, I was thinking of the cases in which uniformed troops, like US rangers, British commandos, or uniformed paratroopers are captured behind enemy lines, and then executed.
Here's an example (from Nazi Conspiracy and Aggression, vol. 5, pp. 330-332; the case is reported more fully at
http://www.ess.uwe.ac.uk/WCC/dostler.htm):
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