And it goes round and round
Staff Sgt. Christopher Matthews, 52nd Component Maintenance Squadron aerospace propulsion systems craftsman, inspects an F-16 Fighting Falcon exhaust nozzle March 16, 2010, at Spangdahlem Air Base, Germany. Once the nozzle passes quality assurance check, it can be installed on an F-16 engine. (U.S. Air Force photo/Airman 1st Class Nick Wilson)