US war games in Iraq in 2002. Saddam won.
In Summer 2002, US forces staged a pretend invasion of Iraq. The pretend forces led by Saddm won the war. Did US military learn anything? No, in fact they kept changing the rules so it would appear they won.
Lieutenant General Paul Van Riper, who lead the pretend Saddam forces, became so disgusted by the cheating US forces that he quit playing.
From a Sept 2, 2002 article in The Guardian:
His driving concern, he tells the Guardian, is that when the real fighting starts, American troops will be sent into battle with a set of half-baked tactics that have not been put to the test.
“Nothing was learned from this,” he says. “A culture not willing to think hard and test itself does not augur well for the future.”