Which entity is the largest of five CSAs and has issued the most classified contracts to industry?

• A. Department of Defense (DOD)
• B. Central Intelligence Agency (CIA)
• C. National Security Agency (NSA)
• D. Federal Bureau of Investigation (FBI)

Answer: (A)

The main point here is the scale of procurement and how much contract work a department handles, especially for classified programs. The Department of Defense oversees the largest portion of the U.S. national security portfolio, with an enormous budget, workforce, and a vast array of programs—many of which are highly sensitive and require contracts with industry. Because defense systems, technologies, and support services span land, sea, air, space, and cyber, DoD classes and runs the bulk of classified contracting, making it the largest source of classified contracts to industry.

The other agencies are crucial to national security, but their total contracting footprint is smaller in comparison. The CIA operates primarily in intelligence with a narrower mission set and tends to contract on a smaller scale. The NSA performs specialized signals intelligence work, often within the DoD framework, but its standalone contract volume is not as large as DoD’s. The FBI focuses on domestic law enforcement and counterintelligence, with a comparatively smaller portfolio of classified contracts.