U.S. Air Force Staff Sgt. Michael Marks, a propulsion mechanic from the Kentucky Air National Guard’s 123rd Airlift Wing, removes an engine from a C-130 Hercules aircraft at the Air National Guard’s Air Dominance Center in Savannah, Ga., June 15, 2016. Marks is attending Maintenance University here, a weeklong course designed to provide intensive instruction in aircraft maintenance. Now in its eighth year, Maintenance University is sponsored by the 123rd Airlift Wing. (U.S. Air National Guard photo by Lt. Col. Dale Greer)