IHS Jane's A&D Analyst Matthew Bell (09/2011)
These companies included Lockheed Martin, General Dynamics, Northrop Grumman, and Raytheon. Since 1990, Lockheed merged with Martin Marietta to become Lockheed Martin, and Northrop merged with Grumman to become Northrop Grumman. When searching for historical stock prices for these two companies, I was able to find records dating back to 1990, but I assume that the stock price which predates the mergers should reflect the stock price of the acquiring company.
Northrop Grumman does not appear to run its own large scale manufacturing operations [-2.3(JIPI)]. During peacetime, Northrop Grumman concentrates more on Foreign Military Sales [.001(MS)] than wartime [.0005(MS)]. Another way of looking at this is that during a period of time where the US government is buying NG products, it shifts its business development efforts overseas.