The number of private contractors in Iraq has now reached about 100,000 — the most ever used in a U.S. military operation. Halliburton subsidiary Kellogg Brown and Root is one of the largest contractors in Iraq. It has more than 50,000 employees and subcontractors working between Iraq, Afghanistan and Kuwait. Blackwater USA has more than 1,000 employees in Iraq. DynCorp has about 1,500 employees there.