Comprised primarily of highly-trained mechanical and aerospace engineers, VSD provides national expertise in the areas of vehicle engineering; guidance, navigation, and controls; robotics; electro-mechanical devices; embedded systems; fluid mechanics; propulsion; thermal control; orbital mechanics; mechanisms; structures; structural dynamics; and dynamic environments. Evaluate the design, analysis, and test methodologies related to aerospace thermostructural technologies, such as liquid rocket engines, solid rocket motors, launch and re-entry vehicle heat shields, and/or hypersonic systems; sub-components typically include composites, solid propellant, joints, seals, igniters, valves, turbopumps, and nozzles.