General Dynamics is an aerospace and defense company. It offers a portfolio of products and services in business aviation, combat vehicles, weapons systems and munitions, shipbuilding, communication and information technology systems and solutions. General Dynamics has four main business segments. Aerospace segment designs, develops, manufactures and services advanced business-jet aircraft. Combat Systems segment specializes in producing, supporting and sustaining land and expeditionary combat systems. Marine Systems segment designs, builds and supports submarines and surface ships. The Information Systems and Technology group offers technology and service capabilities that support a wide range of government and commercial needs, including systems integration expertise, hardware and software products, and engineering, management and support services.