The defense industry has become broader since the beginning of the 21st century. Prior to that time, the defense industry was almost entirely composed of companies that specialized in the research, development, and production of defense weaponry and technologies. After the terrorist attacks of September 11, 2001, the Department of Homeland Security became an important part of national defense, and many new technologies and products were developed to meet the department's increased needs and the needs of more stringent security at airports and other public places. The primary goal of the defense industry is to develop and manufacture products that the military and Department of Defense can use in the protection of the country.

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