Operation Inherent Resolve (OIR) is the U.S. military operation name for the military intervention against the Islamic State of Iraq and the Levant (ISIL), including both the campaign in Iraq and the campaign in Syria.Unlike their coalition partners, and unlike previous combat operations, no name was initially given to the conflict against ISIL by the U.S. government. The decision to keep the conflict nameless drew considerable media criticism. U.S.