Iraqis celebrated the departure of US forces after more ​than two decades of war, though many feared that any security vacuum could increase the power of Iran-backed militias or provide an opening for the return of Islamic ‌State ▻ ↧ Joy mixed with fear as US forces quit Iraq leaving potential securi... Many Iraqis feared that any security vacuum could increase the power of Iran-backed militias or provide an opening for the return of Islamic ‌State.