Rolls-Royce develops, manufactures, markets, and sells power and propulsion systems. The Company's Civil Aerospace segment provides aero engines for large commercial aircraft, regional jet, and business aviation markets. Its Defence Aerospace segment offers military aero engines for combat jets and unmanned aerial vehicles, as well as maintenance, repair, overhaul, helicopter, and training services. The Company's Power Systems segment provides high-speed engines. Its Marine segment manufactures and services propulsion and handling solutions for maritime offshore, merchant, and naval markets. The Company's Nuclear segment provides nuclear submarine systems and support services.