At a Glance: the U.S. Defense Industrial Base

The U.S. defense industrial base's true vulnerabilities lie not with its large prime contractors but deep within its multi-tiered supply chain. Critical defense platforms rely on a complex ecosystem of specialized suppliers providing essential components, materials, and sub-systems. Fragility accumulates in the lower tiers, where smaller, capital-constrained firms face risks like single-source dependencies, limited surge capacity, and exposure to foreign supply chains. Disruptions at these levels can cascade upward, halting production or delaying the delivery of vital military systems.