Andy, I think the one you're thinking of is one from a little while ago where an SAS sniper took out two ISIS animals with one shot.
I really like this quote:
$1:
"One minute he was standing there and the next his head had exploded. The commander remained standing upright for a couple of seconds before collapsing and that's when panic set in. We later heard most of the recruits deserted. We got rid of 21 terrorists with one bullet."
The earlier story, the sniper got a twofer. This was, in effect, a 21......fer.