Where's Waldo, uh, Osama?

Not behind a tree, not down the block.
Can't find him in the country,
perhaps beneath a rock.
In a cave or a valley,
'tween Iraq and some 'istan.
Terrorism in the heart, you were supposed to pursue the terrible man.
Son of your family's friends, your business buds,
Six years late: George, Where's Osama?