I saw in one of Michael Yon's Dispatches from Iraq a couple years back where a Battalion Commander was on a foot chase and did a flip/roll across an opening ..... it got him shot in the leg, IIRC. I looked for it again, and can't find it.... maybe someone else's Google Fu is better than mine....
The only "combat roll" I'm doing is combatting the rolls trying to show up above my belt line......