Senior Airman Sean Donnelly, 5th Maintenance Squadron aerospace propulsion technician assembles the aft mount of a B-52H Stratofortress engine at Minot Air Force Base, N.D., Dec. 4, 2013. Keeping engines fully capable to carry out any task a pilot may have is what the propulsion flight does every day. The Airmen who work on these engines are fully trained and qualified to handle a multitude of procedures. (U.S. Air Force photo/Senior Airman Brittany Y. Auld)