 Complete the following phrase:  Two battalions of Revolutionary Guards were reported to be operating in Iraq trying to combat the 2014 Northern Iraq offensive. The IRGC is considered to be a principle backer of the Popular Mobilization Forces, a loose coalition of Shia militias allied with the Iraqi government in its fight against the Islamic State of Iraq and Syria ISIS. In addition, Major General Qasem Soleimani was an instrumental force in the Iranian ground mission in Iraq against ISIS, purportedly planning the 