A U.S. Air Force KC-135 Stratotanker maintainer, assigned to the 340th Aircraft Maintenance Unit, inspects the aircraft's boom before a flight in support of Operation Inherent Resolve at Al Udeid Air Base, Qatar, June 6, 2017. The KC-135 provides aerial refueling capabilities as it supports U.S. and coalition forces as they work to liberate territory and people under the control of ISIS. (U.S. Air Force photo by Staff Sgt. Michael Battles)