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Defense Industrial Base (DIB)

The Defense Industrial Base is the set of organizations that produce, maintain, and support the materials, components, and services the DoD buys. Over 300,000 companies are in the DIB, from Lockheed Martin to two-person machine shops. The DIB is one of 16 critical infrastructure sectors recognized under Presidential Policy Directive 21. DoD is the sector-specific agency. The cybersecurity program for the DIB is coordinated through the DIB-CS Program.

Who's in the DIB

Prime contractors (Lockheed Martin, Raytheon, Boeing, Northrop Grumman, General Dynamics, L3Harris) sit at the top. Thousands of mid-tier suppliers provide subsystems, components, and services. Tens of thousands of small businesses feed the lower tiers with machining, parts, software, and specialized expertise. A typical weapons platform touches hundreds or thousands of DIB organizations across its supply chain.

Why the DIB Is a Cybersecurity Priority

The DIB holds technical data on U.S. defense capabilities. Nation-state actors have been stealing that data for years. The F-35 design. Naval weapons systems. Stealth coatings. The DoD's response has been to tighten cybersecurity requirements through DFARS, NIST SP 800-171, the DIB-CS Program, and CMMC. The goal is to raise the security floor across every tier of the supply chain.

DIB-CS Program

The DIB Cybersecurity Program (dibnet.dod.mil) is a voluntary information-sharing partnership between the DoD and DIB companies. Participants receive threat intelligence from DC3 and can report incidents in a protected environment. DIB-CS is separate from DFARS 252.204-7012 incident reporting, which is mandatory.

CMMC's Impact on the DIB

CMMC raises the cybersecurity baseline across every DIB tier. A prime can't ignore the security posture of a seventh-tier supplier anymore if that supplier handles CUI. Flow-down through DFARS 252.204-7012 pushes the same obligations throughout the chain. Over time, this is expected to consolidate DIB suppliers: smaller companies that can't justify the compliance cost will either invest, merge, or exit.