Air Force pilots and crew chiefs discus their mission plan and preflight checks near a KC-135 Stratotanker at Al Udeid Air Base, Qatar, Dec. 1, 2016. The pilots and crew chiefs are assigned to the 340th Expeditionary Air Refueling Squadron. The squadrons extend the fight by delivering 34,600 pounds of fuel to Air Force F-15 Strike Eagles. Air Force photo by Senior Airman Jordan Castelan