Lockheed Martin was formed by the merger of former Lockheed and Martin marietta. At present, its core business is aviation, electronics, information technology, aerospace systems and missiles. Its main products include all submarine-launched ballistic missiles, theater high-altitude air defense systems, communication satellite systems, F- 16, F-22 and F-35, as well as U-2 and SR-76545 fighters. C-5 series "Galaxy" large military transport aircraft and anti-submarine aircraft P-3 series and C- 130 series military transport aircraft cover the production and launch business of almost all military satellites in the United States and become world-class arms "giants".
Boeing is a leading company in the global aerospace industry and the largest manufacturer of civil and military aircraft in the world. In addition, Boeing also designs and manufactures rotorcraft, electronic and defense systems, missiles, satellites, launchers and advanced information and communication systems. As a major service provider of NASA, Boeing operates the space shuttle and the International Space Station. Boeing also provides many military and civil aviation support services, and its customers are distributed in more than 90 countries around the world. In terms of sales, Boeing is one of the largest exporters in the United States. Raytheon is a large American defense contractor, headquartered in Lexington, Massachusetts. Raytheon has 73,000 employees worldwide, with a turnover of about US$ 20 billion, of which more than 90% comes from defense contracts. According to the data in 2005, Raytheon is the fifth largest national defense contractor in the world (unknown now), which is composed of five main business departments: National Defense Systems Department; Department of sensing and electronic systems; C3 System Command, Control and Communication Department; Department of Intelligence, Information and Aircraft Integrated Systems; Training and technical services department. General Dynamics is a comprehensive defense group company headquartered in the suburb of Baltimore, Virginia. General Dynamics is the largest arms dealer in the United States and one of the defense contractors. Its industry is divided into four major areas: first, navigation equipment, mainly manufacturing warships and nuclear submarines; The second is the aviation field, including commercial aircraft and fighters; The third is the information system and technology department; The fourth is the manufacture of offensive weapons. The company has some departments and subsidiaries, and several of them were acquired. Through intelligent acquisition and flexible management after acquisition, sales and net income have been greatly improved. Northrop Grumman, which has10.2 million employees, is one of the giants of American arms industry. Its boss is Ronald Sugar, 59, and he is known as "the standard bearer who leads the arms industry to climb the technological peak in the future". Northrop Grumman Company is one of the major aerospace vehicle manufacturers in the United States, which was formed by the merger of the former Northrop Company and Grumman Company in 1994. 1In July 1997, Northrop Grumman and Lockheed Martin proposed to merge, but the US government did not approve it.