Defence Secretary Chuck Hagel yesterday announced the deployment in remarks to Marines at Camp Pendleton, California.
"This is not a combat boots on the ground kind of operation," Hagel said. "We're not going back into Iraq in any of the same combat mission dimensions that we once were in in Iraq," he added, referring to the eight-year war that cost more than 4,400 US lives and soured the American public on military involvement in Iraq.
Hagel referred to the 130 as "assessors."
The additional troops arrived yesterday in the city of Irbil, well east of Sinjar. They are to work with representatives of the State Department and the US Agency for International Development to coordinate plans with international partners and non-government organisations to help the trapped Yazidi civilians on Sinjar Mountain.
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President Barack Obama has said repeatedly he will not send ground combat forces back into Iraq.
One immediate dilemma is the fate of thousands of displaced Yazidis in the Sinjar area who have been provided with food and water delivered by US cargo planes in recent days. Washington also is considering how to increase its military assistance to the Kurds, whose militia is outgunned by the militants.