carolina. >> their mission will be train, advice and assist iraqi security forces, this deployment is part of the additional 1,500 troops that the president authorized in november. >> reporter: there are currently 1,860 troops in iraq. the new deployment will nearly double that number and u.s. involvement will not end any time soon according to the u.s. general overseeing the mission. >> i think you're at least talking three years. >> reporter: the current strategy reelys on air strikes like this one that targeted an ied never mt. sin jar. >> they need more forces to assist those indigenous forces and we're going at that very incrementally. that's a pattern they have seen before that's very disturbing to them. >> in fact five months after the u.s. relaunched military operations in iraq, the pentagon says there are still yazidis p trapped on mt. sinjar.

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