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Lockheed Martin Corporation is an American global aerospace, defense, security and advanced technologies company with worldwide interests. It was formed by the merger of Lockheed Corporation with Martin Marietta in March 1995. It is headquartered in North Bethesda, Maryland, in the Washington, D.C., area. Lockheed Martin employs approximately 100,000 people worldwide as of December 2017.Lockheed Martin is one of the largest companies in the aerospace, defense, security, and technologies industry. It is the world's largest defense contractor based on revenue for fiscal year 2014.