Babcock International Group plc is a multinational corporation headquartered in the United Kingdom, which specialises in support services managing complex assets and infrastructure in safety- and mission-critical environments. Although the company has civil contracts, its main business is with public bodies, particularly the UK Ministry of Defence and Network Rail. The company has four operating divisions with overseas operations based in Africa, North America & Australia. It is the world's 41st-largest defence contractor measured by 2010 defence revenues, and the third-largest based in the UK (after BAE Systems and Rolls-Royce).