From the Document: "The Department of Defense (DOD) relies on a wide-ranging and complex industrial base for the products and services that enable the Department's warfighting capabilities. Definitions of what this industrial base encompasses vary in scope and emphasis. Some analysts and experts distinguish between a domestic 'defense industrial base' (DIB) and a global DIB. The domestic DIB includes public-sector (government-owned, government-operated) facilities, academic institutions, and private-sector (commercial) companies located in the United States. Congress has taken some interest and action to support and sustain the domestic DIB. [...] The DIB entities that work with the DOD as prime contractors and subcontractors are diverse, ranging in size from small- and medium-sized businesses to some of the world's largest corporations. Together, these entities provide a wide range of products and services to the DOD, encompassing everything from complex platforms unique to the military (e.g., aircraft carriers) and highly specialized services (such as launching military satellites), to all kinds of commercial products (e.g., laptop computers and semiconductors) and routine services (e.g., information technology (IT) support)."
CRS In Focus, IF10548
Congressional Research Service: https://crsreports.congress.gov/