Aerojet Rocketdyne (formerly GenCorp) wants to take you higher -- if you're a rocket, that is. The company is one of the largest manufacturers and suppliers of propulsion systems for defense and space applications in the US. These systems are used in missiles, maneuvering systems, launch vehicles, spacecraft, and satellites. Virtually all its revenue comes from aerospace and defense. Principal customers include the US Department of Defense, NASA, and Lockheed Martin. In 2015 the company changed its name to Aerojet Rocketdyne Holdings. Aerojet refers to a longtime part of the company and Rocketdyne to a significant acquisition. The company also has a much smaller business segment that deals in real estate.