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The population of Northrop Grumman is 10.
Northrop Grumman was created in 1927.
Grumman didn't close. It became Northrop Grumman when it merged with Northrop.
Northrop Grumman does have several locations in Colorado.
Northrop and Grumman were both successful and separate aircraft companies till Northrop acquired Grumman in 1994 and became a huge defence contractor.