article_snippet: " U.S.-led efforts to train a new Iraqi army designed to defeat ISIS are well underway.
article_snippet: Tit-for-tat atrocities are fuelled by a stream of social media videos showing abuses committed by all sides.
article_snippet: ISIS use of children: Propaganda and military training .
article_snippet: CNN's Ben Wedeman and Kareem Khadder contributed to this story.