Re: shooting prisoners.....
One time a friend of my father's got to talking on a fishing trip after they had been drinking.
Said he was given charge of about 10 prisoners, and told to escort them back to area where prisoners were being collected a few miles behind the lines.
Said the officer said something to the effect of " take these pows to the collection area and be back in 10 minutes."
Said the officer was very clear on the be back in 10 minutes part, so he marched them a couple hundered yards back of the lines and hosed them with a "burp" gun.
IIRC, this was during Korea, but could be mistaken.