U.S. Air Force aircrew assigned to the 340th Expeditionary Air Refueling Squadron return from flight on a KC-135 Stratotanker at Al Udeid Air Base, Qatar, April 8, 2016. Coalition forces fly daily missions in support of Operation Inherent Resolve. OIR is the coalition intervention against the Islamic State of Iraq and the Levant. (U.S. Air Force photo by Staff Sgt. Corey Hook/Released)