isis claimed most of these lives, but the kurds now say these recent terror attacks and the military offensive are part of the coordinated turkish-led campaign of ethnic cleansing to drive them from this area. u.s. defense officials tell cbs news that the military is now completed its withdrawal of the kobani air base, norah, that was the main logistics hub coordinating that initial u.s. drawdown, but hundreds of troops remain. >> o'donnell: charlie in syria tonight, thank you. tonight we have exclusive details on colin kaepernick's possible return to the football field. the quarterback sidelined since starting the player protests during the national anthem has now been invited to work out for n.f.l. teams. special correspondent james brown spoke today with n.f.l. commissioner roger goodell. j.b., what did the commissioner have to say? >> reporter: norah, i was with the commissioner at a leadership summit here in new york when we talked about the business of football. afterward i asked him about the kaepernick workout.hiupcoming