It's rarer for blowback terrorism to occur. When it happens, it could result in much higher casualty figures like 9/11 or Paris.
By the way, the US military is working wit former Saddam Hussein government officials AGAIN.
Last month's raid on an Islamic State prison in Hawija, Iraq, conducted by a U.S. Delta Force Team and Kurdish special forces resulted not only in the death of the first American in the country since 2011 and the beheading of four Kurds by the jihadists. According to a Kurdish intelligence chief, it also ended up freeing scores of the former tormentors of his people: Iraqis still loyal to the Baathist ideology of Saddam Hussein. And it has exacerbated new political divisions among the Kurds, who have been the U.S.'s best allies in the fight against the Islamic State.
Initially the raid was said to have freed 69 Kurdish prisoners. But within 24 hours the Kurdistan Regional Government officially said no Kurds were freed. At the Washington Institute for Near East Policy on Tuesday, Lahur Talabani, the head of the Kurdish Zanyari intelligence service, said the raid instead ended up freeing Arab members of the Naqshbandi Army, a Baathist group formed of former high-ranking intelligence and military officers loyal to Saddam Hussein.
While the U.S. allied with some former Baathists during the counter-insurgency in 2007 and 2008 known as the surge, the strategy of teaming up with former members of the regime never sat well with many Kurds. What's more, the Islamic State has counted on collaboration from many Baathists as well, who are largely fellow Sunni Muslims. While the freed Baathist prisoners could provide intelligence for the U.S.-led coalition, the high-risk operation may well have ended up freeing prisoners whose compatriots have backed the Islamic State.
http://www.bloombergview.com/articles/2015-11-03/kurdish-intelligence-chief-says-deadly-raid-freed-baathists