 Complete the following phrase:  The town and subdistrict fell to the Islamic State of Iraq and the Levant in June 2014. It was reported that its recapture was of strategic importance for the offensive to retake Mosul in 2016. In August 2016, Qayyarah was fully captured by Iraqi forces, with Lieutet General Riyadh Jalal Tawfiq stating that they controlled all parts of the city and Prime Minister Haider al-Abadi hailing the capture of the city as a key step in the fight against ISIL. In July 2016, the Pentagon said they were sending another 560 troops to Iraq, mainly to develop the Qayyarah airfield and use it as support for the planned attack on Mosul. Following the towns liberation, members of the Jubur tribe from Qayyarah and surrounding villages formed the Popular Mobilization Forces 39th Regiment nicknamed Commandos of al-Jubur or Lions of the Tigris to fight against ISIL. This unit subsequently took part in the 