Senior Airman Daniel Proben, a 908th Expeditionary Air Refueling Squadron boom operator, conducts pre-flight checks in a KC-10 Extender, Aug. 18, 2020, at Al Dhafra Air Base, United Arab Emirates. Proben can use either an advanced aerial refueling boom or a hose and drogue centerline refueling system to refuel a wide variety of U.S. and allied military aircraft during missions in Air Forces Central Command area of responsibility. (U.S. Air Force photo by Tech. Sgt. Melissa Harvey)