missile defense systems

From Wikipedia: Raytheon:

Raytheon Company is a major American defense contractor and industrial corporation with core manufacturing concentrations in defense systems and defense and commercial electronics. It was previously involved in corporate and special-mission aircraft until early 2007. Raytheon is the world's largest producer of guided missiles.
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In an effort to establish leadership in the defense electronics business, Raytheon purchased in quick succession Dallas-based E-Systems (1995), Chrysler Corporation's defense electronics and aircraft-modification businesses (1996) (portions of these businesses were later sold to L-3 Communications), and the defense unit of Texas Instruments - Defense Systems & Electronics Group (1997). Also in 1997, Raytheon acquired the aerospace and defense business of Hughes Aircraft Company from Hughes Electronics Corporation — a subsidiary of General Motors, which included a number of product lines previously purchased by Hughes Electronics including the former General Dynamics missile business, the defense portion of Delco Electronics (Delco Systems Operations), and Magnavox Electronic Systems.
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Raytheon, often in conjunction with Boeing, Lockheed Martin or Northrop Grumman, is also heavily involved in the satellite sensor business.

From Wikipedia: Northrop Grumman:

Northrop Grumman Corporation (NYSE: NOC) is an American aerospace and defense technology company formed by the 1994 purchase of Grumman by Northrop. The company was the fourth largest defense contractor in the world in 2008, and the largest builder of naval vessels. Northrop Grumman employs over 122,000 people worldwide. Its 2007 annual revenue is reported at US$32 billion. Northrop Grumman ranks #76 on the 2008 Fortune 500 list of U.S. industrial companies. It is headquartered in Los Angeles, California.