Engineering services for missile systems and aviation technologies, namely, modeling and simulation, system analysis, design and development, fabrication, systems integration, and test and evaluation, with a focus in navigation, guidance and control technologies including inertial sensors and systems, Global Positioning System (GPS) receivers and antennas, guidance law/theory, Kalman filters, seekers, and control actuation systems; design and development of specialized circuit boards, automated test and data collection hardware and software, on-board flight data recorders used in missile flight testing, and hardware-in-the-loop (HWIL) testbeds