Volcanic ash is sprayed into one of the F117 engines of a C-17 during the final phase of the Vehicle Integrated Propulsion Research (VIPR) project July 9 at Edwards. The VIPR team, comprised of NASA employees, U.S. Air Force employees and multiple agencies and companies, will demonstrate engine advanced health management and diagnose potential engine faults regarding volcanic ash intake. (NASA AFRC photo by Tom Tschida)