U. S. Air Force Senior Airman Hector Acevedo, 340th Expeditionary Air Refueling Squadron boom operator, shows U.S. Ambassador to Qatar, Dana Shell Smith, how they control the boom of a KC-135 Stratotanker April 27, 2015 at Al Udeid Air Base. (U.S. Air Force photo by Tech. Sgt.Rasheen Douglas)