If you look at casualties, you find countries that had much higher loss rates per capita than the US. Denmark comes to mind, the United Kingdom, they have suffered heavy losses at various points, the Germans as well.

This is actually true of the overall fight against al-Qaeda and trans-national extremists, that as you put pressure on them in one location, they'll seek safe haven sanctuaries in other areas. So you do have to continue to pursue them. But they have less capability.

I think no commander ever is going to come out and say, 'I'm confident that we can do this.'

David Petraeus Quotes