Which two aerospace giants merged in 1997 to form the world's largest defense contractor at that time, following the Pentagon's post-Cold War encouragement of defense industry consolidation?

Throughout the late 20th century, the defense industry underwent massive consolidation as Cold War spending declined. Major defense contractors merged to survive in a changing market with reduced military budgets. These mergers created the handful of dominant defense conglomerates that supply modern militaries today. Test your knowledge of how today's military-industrial complex took shape through corporate consolidation.

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Lockheed Corporation and Martin Marietta
Boeing and McDonnell Douglas
Northrop and Grumman
General Dynamics and Raytheon