Staff Sgt. Thomas Mariano (left) and Staff Sgt. Kenneth O'Callaghan (right), 446th Aircraft Maintenance Squadron aerospace propulsion specialists, inspect the engines of a C-17 Globemaster III at Naval Station Rota, Spain, February 23, 2016. These engines can produce more than 40,000 pounds of thrust. (U.S. Air Force Reserve photo by Staff Sgt. Madelyn McCullough)