The United States will send around 600 new troops to Iraq to assist local forces in the battle to retake Mosul from Islamic State that is expected later this year, U.S. and Iraqi officials said on Wednesday.
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The new deployment is the third such boost in U.S. troop levels in Iraq since April, underscoring the difficulties President Barack Obama has had in extracting the U.S. military from the country.
"American President Barack Obama was consulted on a request from the Iraqi government for a final increase in the number of trainers and advisers under the umbrella of the international coalition in Iraq," Iraqi Prime Minister Haider al-Abadi said in a statement.
The new troops will train and advise Iraqi security forces and Kurdish peshmerga forces, primarily in the Mosul fight but also serve "to protect and expand Iraqi security forces' gains elsewhere in Iraq," U.S. Defense Secretary Ash Carter said.
"We've said all along - whenever we see opportunities to accelerate the campaign, we want to seize them," Carter said.
Some of the 615 new service members will be based at Qayara air base, about 40 miles (60 km) from Mosul, Carter said. Iraqi forces recaptured the base from Islamic State militants in July and have been building it into a logistics hub to support their offensive into the northern city.
Other U.S. troops will go to Ain al Asad air base in western Iraq, where hundreds of U.S. personnel have been training Iraqi army forces.
Carter, who spoke to reporters while traveling in New Mexico, declined to name other locations where the new U.S. forces will be based.
Though Iraqi forces will be in the combat role, "American forces combating ISIL in Iraq are in harm’s way," Carter said, using an acronym for Islamic State. "No one should be in any doubt about that."
Three U.S. service members have been killed in direct combat since the launch of the U.S. campaign against Islamic State.
Abadi met Obama and Vice President Joe Biden last week on the sidelines of the UN General Assembly in New York, though it was not clear whether the agreement was sealed there.
The United States currently has 4,565 troops in Iraq as part of a U.S.-led coalition providing extensive air support, training and advice to the Iraqi military, which collapsed in 2014 in the face of Islamic State's lightning advance towards Baghdad.
Iraqi forces, including Kurdish peshmerga forces and mostly Iranian-backed Shi'ite militias, have retaken around half of that territory over the past two years but Mosul, the largest city under the ultra-hardline group's control anywhere across its self-proclaimed caliphate, is likely to be the biggest battle yet.
The United States has gradually increased the number of U.S. troops in Iraq this year, and moved them closer to the front lines of battle. Obama approved sending 560 more troops to Iraq in July, three months after the United States said it would dispatch about 200 more troops there.
To send the new troops, the White House will raise its cap on U.S. forces in Iraq from 4,647, to 5,262 troops, a senior U.S. defense official said.
U.S. and Iraqi commanders say the push on Mosul could begin by the second half of October. Carter said the campaign to expel Islamic State from Mosul would intensify "in the coming weeks."
The recapture of Mosul, Islamic State's de facto Iraqi capital, would be a major boost for plans by Abadi and the United States to weaken the militant group.
Current U.S. troop levels in Iraq are still a fraction of the 170,000 deployed at the height of the nine-year occupation that toppled Saddam Hussein in 2003, sparking an al Qaeda-backed insurgency and throwing the country into a sectarian civil war.
Loath to become mired in another conflict overseas, the White House has insisted there would be no American "boots on the ground." While coalition troops were initially confined to a few military bases, Americans have inched closer to the action as the campaign progresses.