And just last month one of the largest employers in the region, Northrup Grumman, which builds ships, announced the closure of its local operations.

就在上个月，该地区的最大雇主Northrup Grumman，一家造船公司，宣布关闭其地方分公司。

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U.S. defense giant Northrup Grumman is among several big names missing from this year's show.

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"Private contractors are not happy about this, " says a source familiar with information security executives at contractors Northrup Grumman and Boeing.

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Boeing, the largest U.S. aerospace company by market cap, competes with companies like Lockheed Martin, Northrup Grumman, Raytheon and General Dynamics.

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