U.S. Air Force Senior Airman Jadon Sylvester, flight engineer, prepares to board a KC-10 Extender after conducting pre-flight checks on March 2, 2018 at the 380th Air Expeditionary Wing, Al Dhafra Air Base, United Arab Emirates. The KC-10 can refuel a wide variety of U.S. and allied military aircraft within the same mission. (U.S. Air Force photo by Tech. Sgt. Anthony Nelson Jr.)