Figured that would get your interest It seems that during WW2 there was a ploy on the part of MI5 to persuade the Germans that British soldiers painted their feet blue so that they could be easily identified, thus enabling the Home Guard to identify German agents. Rather interesting article courtesy of the BBC:

http://news.bbc.co.uk/1/hi/uk/4235463.stm

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There's no honorable way to kill, no gentle way to destroy. There is nothing good in war. Except its ending.