1. US Department of Defense (USDOD): 

Employs nearly one percent of the U.S. population, U.S. Department of Defense tops the list of biggest employers in the world with a 3.2 million people. U.S. Department of Defense headquartered at the Pentagon, Arlington Co., Virginia. Executive Department of U.S. government, USDOD is to organize and direct all agencies and functions of the government which are mainly related to the national security and the U.S. armed forces.

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