U.S. Air Force Airman 1st Class Craig Mason and Staff Sgt. Curtis Gempler, 86th Aircraft Maintenance Squadron aerospace propulsion maintainers, repair an auxiliary power unit on a C-130J Super Hercules, Ramstein Air Base, Germany, March 30, 2010. (U.S. Air Force photo by Airman 1st Class Grovert Fuentes-Contreras)