original question: Which spacecraft manufacturer is merged with [Martin Marietta]?
answer: lockheed corporation
answer type: Spacecraft Manufacturer.
auxiliary information: The Martin Marietta Corporation was an American company founded in 1961 through the merger of Glenn L. Martin Company and American-Marietta Corporation. The combined company became a leader in chemicals, aerospace, and electronics. In 1995, it merged with Lockheed Corporation to form Lockheed Martin.
Which spacecraft manufacturer is merged with [Martin Marietta]?