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“Your child could develop a brain injury as a result of playing football,” NFL Hall of Famer Harry Carson tells FRONTLINE. And leading brain researcher Dr. Ann McKee says she personally wouldn’t let young children play, for that very reason.

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What does the future hold when it comes to America’s involvement in the fight against ISIS in Iraq and Syria? In this excerpt from "The Rise of ISIS" premiering 10/28 (http://to.pbs.org/1wkM7vO) FRONTLINE's Martin Smith asks Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey and one of President Obama’s top foreign policy advisers, Ben Rhodes, what comes next.

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Funding for FRONTLINE's YouTube channel is provided by the Knight Foundation. FRONTLINE is made possible by PBS and CPB. Major support is provided by The John D. and Catherine T. MacArthur Foundation. Additional support is provided by the Park Foundation, the Ford Foundation, the Wyncote Foundation and Jon and Jo Ann Hagler on behalf of the Jon L. Hagler Foundation.