Millennium is a thought-leader in Model-based systems engineering and development applied to complex systems including spacecraft, ground systems, and launch systems. We have experience delivering hardware/software development and engineering success using modeling and simulation to provide integrated systems.  Using MBSE and MBSD techniques, we develop models of space vehicle flight software, launch vehicle guidance and navigation and control software, and automatically generate high-level control software integrated with hand-written and heritage software. We also develop the ground based workstation simulators, processor-in-the-loop, hardware-in-the-loop, and automated self-documenting tests.