Like JCB said, picture US casualties in Bosnia or Kosovo, and then compare that to our casualties in Afghanistan or Iraq. On one hand, you've got peacetime casualty figures, and on the other, combat operations.
Bosnia and Kosovo never turned into what Iraq is turning into, and it didn't because the "Mujahadeen" hype was just that: hype. They were there, but never in large enough numbers to effect the course of the war, and they were invited to leave immediately thereafter, save a few who managed to get themselves hitched and watched closely by various intelligence agencies for their troubles.