A KC-135 Stratotanker takes off from the flightline Dec. 31, 2014, at Al Udeid Air Base, Qatar. The 340th Expeditionary Air Refueling Squadron here surpassed a major milestone with their Roll-On Beyond Line of Sight Enhancement data link system when the unit completed 40,000 flight hours while supporting combat missions in the U.S. Central Command area of operations. (U.S. Air Force photo by Staff Sgt. Mariko Frazee)