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    Iran unit with U.S. blood on its hands fights ISIS

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Iran unit with U.S. blood on its hands fights ISIS

An Iranian unit that has killed U.S. soldiers before is also fighting ISIS further complicating U.S.-Iran relations. CNN's Brian Todd reports.

Iran unit with U.S. blood on its hands fights ISIS

An Iranian unit that has killed U.S. soldiers before is also fighting ISIS further complicating U.S.-Iran relations. CNN's Brian Todd reports.