From the Document: "The Department of Defense (DOD) relies on a wideranging and complex industrial base for products and services required to support DOD's stated mission 'to provide the military forces needed to deter war and to protect the security of our country.' This defense industrial base comprises public-sector (government-owned, government-operated) facilities and private-sector (commercial) companies. The commercial companies that contract with DOD are diverse, ranging in size from small businesses to some of the world's largest corporate enterprises. These commercial companies provide a wide variety of products to DOD, encompassing everything from complex military-unique platforms such as aircraft carriers to common commercial items such as laptop computers, clothing, and food. They also provide a wide variety of services, including everything from routine services (e.g., information technology (IT) support) to highly specialized services (e.g., launching space vehicles). Domestically owned firms and foreign-owned firms that engage in direct investment, hire U.S. workers, and are governed by U.S. laws are part of the nation's defense industrial base."
CRS In Focus, IF10548
Congressional Research Service: https://crsreports.congress.gov/