Aerojet Rocketdyne is an American aerospace and defense company that specializes in propulsion and power systems. Founded in 1942, it designs and manufactures rocket engines and other technologies for space exploration, defense, and commercial applications. The company plays a crucial role in various programs, including those for NASA and the U.S. Department of Defense. The company is known for its innovative products, such as the RL10 rocket engine, which has been used in many space missions. Aerojet Rocketdyne also focuses on developing advanced technologies, including electric propulsion systems, to enhance the efficiency and capabilities of space travel.