Reducing Defense Supply Chain Risk: A Guide for OEMs

Picture this: A part shows up two months late, a supplier goes quiet after a change in ownership, or a single bracket turns out to have exactly one source in the entire country. While none of that might show up on a spec sheet, it can decide whether a defense program hits its schedule. Defense supply chain risk has become a bigger part of the sourcing conversation than it was even a few years ago. Geopolitical pressure, tightening cybersecurity rules, and a defense suppliers spread across thousands of small manufacturers have made supply chain a design consideration, not just a procurement one.

Why Supply Chain Risk Has Become a Top Concern

The pressure comes from several directions at once. Material costs and availability shift with geopolitics, so a sourcing decision made under stable conditions can turn risky the moment a region grows unstable or a material becomes politically sensitive. Lead times on castings, forgings, and specialty alloys have stretched well past what most programs planned for, and skilled labor is harder to find across the trades, from press operators to toolmakers. Add the government’s push for tighter cybersecurity controls, and sourcing starts to look less like procurement and more like defense supplier risk management.

The scale of the problem makes it hard to manage. The Department of Defense depends on more than 200,000 companies to help produce its weapon systems, and by its own estimate, 60 to 70 percent of prime contract dollars flow down to lower-tier suppliers it has far less visibility into. A 2018 federal industrial base review identified nearly 300 specific vulnerabilities, ranging from a single U.S. supplier of ship propeller shafts to a shortage of skilled aircraft workers. Government acquisition officials still rank supply chain challenges among their top concerns today, according to the National Defense Industrial Association’s 2026 industry survey, even though private-sector respondents ranked it lower than in previous years.

Common Sources of Supply Chain Risk

Relying on one supplier for a critical component can work fine until it doesn’t. A fire, an equipment failure, an ownership change, or a company exiting the defense market can stall a program overnight. Government auditors have flagged this exact issue, pointing to items like solid rocket motor propellant and certain shipbuilding components where the entire domestic supply chain runs through one or two vendors.

Offshore dependencies bring their own risks to a defense manufacturing supply chain. Costs can look attractive on a quote, but the real expense often shows up later, in transportation delays, tariff exposure, time-zone communication gaps, and exposure to political instability outside anyone’s control. A supplier three time zones away can’t always answer a tolerance question the same day it’s asked.

Cybersecurity has become a sourcing issue. DFARS clause 252.204-7012 has required safeguarding of covered defense information for years, but the Cybersecurity Maturity Model Certification (CMMC) program has changed how that requirement gets verified. Requirements began appearing in new DoD solicitations in November 2025, and a documented self-assessment is now a condition of contract eligibility for many suppliers.

CMMC Compliance in Manufacturing

CMMC gives the Department of Defense a standardized way to verify that a contractor’s cybersecurity controls match the sensitivity of the information it handles. Level 1 covers basic safeguarding for Federal Contract Information. Level 2, which applies to most manufacturers handling Controlled Unclassified Information, requires 110 security controls from NIST SP 800-171.

CMMC compliance in manufacturing is becoming a fast way for OEMs to screen supplier risk. A certified supplier has already invested in protecting sensitive data, documented its processes, and opened itself up to outside verification. Disciplined security practices tend to travel with disciplined manufacturing practices. Waukesha Metal Products is currently pursuing CMMC certification as part of that same commitment, treating it as an operational priority rather than a box to check.

Why North American Defense Manufacturing Strengthens the Supply Chain

Geography still matters, even in a connected economy. A domestic supplier can answer a question in real time, sit in on a design review in person, and ship a part without crossing a border that might close or add a tariff without notice. This proximity shows up in shorter lead times, tighter communication, and better visibility into how a part is produced. Most goods the Department of Defense purchases are already manufactured domestically, and the government’s industrial base strategy treats North American defense manufacturing as a priority worth investing in.

Characteristics of a Low-Risk Manufacturing Partner

A few traits tend to separate low-risk partners from the rest:

• Manufacturing stability: a long operating history and documented quality systems like ISO 9001, IATF 16949, and AS9100
• Production scalability: the ability to flex from prototype quantities to full-rate production without changing vendors mid-program
• Supply chain visibility: proactive communication about material status and capacity, before being asked rather than only when asked
• Compliance awareness: working knowledge of ITAR and CMMC built into daily operations, not assembled before an audit
• Program management support: a single point of contact who can resolve issues quickly

These traits rarely appear all at once in a new relationship. They surface over years of programs and problems solved together, which is why OEMs benefit from evaluating a supplier’s track record as closely as its equipment list.

Resilience Through Strategic Partnerships

The strongest defense supply chains come from an ongoing relationship where the OEM and manufacturer plan together: forecasting demand early, flagging risks before they become schedule problems, and working through contingency plans before they’re needed. A supplier who only hears from a program manager after something has gone wrong isn’t positioned to help prevent the next one.

Cost still matters in defense manufacturing, but it no longer decides who wins the work on its own. Reliability, manufacturing capability, transparency, and cybersecurity readiness now carry real weight in that decision.