The Iraqi forces defeated by IS fighters in their takeover of Ramadi were not outnumbered and in fact showed "no will to fight", Defence Secretary Ashton Carter said.
"What apparently happened was that the Iraqi forces just showed no will to fight. They were not outnumbered but in fact they vastly outnumbered the opposing force, and yet they failed to fight. They withdrew from the site," Carter said in an interview to the CNN.
He said the US can give training and equipment to Iraqi forces, but cannot give them the will to fight.
"But if we give them training, we give them equipment and give them support and give them some time, I hope they will develop the will to fight," Carter said.
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Carter's remarks are the strongest yet from any Obama administration official speaking on the record since the last week's events when Ramadi fell.
"We can participate in the defeat of IS but we can't make Iraq run as a decent place for people to live. We can't sustain the victory. Only the Iraqis can do that, and in particular, in this case, the Sunni tribes to the west," he said.
Carter said he was not prepared to recommend sending ground troops into Iraq. In the wake of IS advances, some lawmakers including Senate Armed Services Committee Chairman John McCain --have called for more American forces on the ground in Iraq. Currently, there are about 3,000 US military personnel training Iraqi forces, but they are not near combat areas.
"So our efforts now are devoted to providing their ground forces with the equipment, the training, and to try to encourage their will to fight so that our campaign enabling them can be successful both in defeating IS and keeping IS defeated in a sustained way," Carter said.