Where does the expression 'to go commando' come from?

Going Commando - Many people claim that they 'go commando'. But what's the origin of this expression?
@Thomas73 (1467)
Switzerland
February 5, 2007 11:11am CST
This is a question for the Americans here at myLot. I have seen this expression in my "No Underwear" discussion, and guessed that it meant to describe a woman who's not waering any knickers. Ok, I got the meaning, but where does this strange expression come from? Thanks in advance for some clear answers!
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