MOSUL, IRAQ - OCTOBER 17: Peshmerga forces located Khazir front at Zardak Mountain assemble an unmanned aerial vehicle (UAV or) with the guidance of US soldiers as they prepare to attack Daesh targets during an operation to retake Iraq's Mosul from Daesh in Mosul, Iraq on October 17, 2016. A much anticipated Mosul offensive to liberate the city from Daesh began midnight Sunday, according to Iraqi Prime Minister. (Photo by Emrah Yorulmaz/Anadolu Agency/Getty Images)