LANGLEY AIR FORCE BASE, Va. - Staff Sgt Cesar Delgadillo, 1st Component Maintenance Squadron aerospace propulsion craftsman, and Airman 1st Class Mathew Santianna, 1st CMS aerospace propulsion journeyman, prepare to test a Pratt and Whitney F119-PW-100 engine at the hush house, April 9. The crew can control the engine remotely from a specially-designed mobile control center, called a “run cab.” (U.S. Air Force photo/Airman 1st Class Gul Crockett)