In recent years, policymakers have increased emphasis on national security risks deriving
from globalization of weapon system supply chains to include foreign suppliers. We define
supply chain as the tiered network of entities providing goods and services culminating in a
deliverable to the U.S. Air Force (USAF), such as a product (e.g., a component of a weapon
system) or a service. Suppliers are chiefly commercial firms and include manufacturers, service providers, and distributors. Inputs from upstream suppliers include raw materials, parts or components, machinery, and labor. Each supplier in the chain undertakes some production activity and then provides outputs to the next firm in the chain. The chain ends with the suppliers that are the prime contractors for USAF.

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