NASA is committed to continuously improving the safety of the Space Shuttle Program’s crew and space vehicles. Glenn Research Center is conducting extensive modeling, testing and analysis in support NASA’s Shuttle safety efforts. They are involved in assessing the safety of the Composite Overwrapped Pressure Vessels and investigating the chemistry and oxidation of Reinforced Carbon-Carbon (RCC). Also, subsystem engineers at Glenn monitor the Shuttle’s Purge, Vent and Drain (PVD) and Stress, Loads and Dynamics (SLD) subsystems before, during and after flight to ensure crew and vehicle safety.