President Obama made the decision following a request from Iraqi Prime Minister Haider Al-Abadi, it said.
The troops will be deployed to the Taqaddum military base in Anbar province. IS seized Ramadi – the capital of Anbar – in May.
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It has made gains across the region despite US-led coalition air strikes.
The move is aimed at enabling more Iraqis – mostly Sunni tribal volunteers – to integrate into the Iraq army and reclaim territory from Islamic State.
“These new advisers will work to build capacity of Iraqi forces, including local tribal fighters, to improve their ability to plan, lead, and conduct operations” against IS in Anbar, the White House statement added.
Islamic State took control of Iraq’s second city Mosul a year ago. It has also captured the Syrian town of Tadmur and the neighbouring ancient ruins of Palmyra.
The deployment of military advisers to Taqaddum brings the number of US training camps in Iraq to five.
Some 9,000 Iraqi troops have already been trained at Al-Asad, Besmaya, Irbil, and Taji, the White House said.
President Obama continues to resist demands for combat troops.
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