The role of Iranian-backed militias is introducing an obstacle for the Iraqi Government in its effort to reclaim the territories that fell out of its control. Since the fall of Mosul in 2014, these militias have played a crucial role in retaking areas from ISIS with minimal support from coalition air power and heavy reliance on Iranian support. The lack of precise coalition targeting is for the first time a limiting factor leading Iraqi commanders to halt the operation to retake Tikrit.