Fighters from the Islamic State group parade in a commandeered Iraqi security forces armored vehicle down a main road at the northern city of Mosul, Iraq, on June 23, 2014. The operation to retake Iraq's second-largest city from Islamic State militants will likely begin in April or May and will involve about 12 Iraqi brigades, or between 20,000 and 25,000 troops, a senior U.S. military official said Feb. 19, 2015. (Associated Press) **FILE**
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