Rare earth magnets are essential components in systems like the F‑35, wind turbines, drones, and missiles. The U.S. Department of War (DoW) recently invested in U.S. companies to expand domestic magnet manufacturing and heavy rare earth processing, an investment that marks a strategic pivot. It also exposes the fact that the vulnerability in rare earth supply chains is not due to geological scarcity. It stems from the extreme concentration of refining capacity, the complex interdependencies among the 17 rare earth elements (REEs), and the limited options for substitution in high-performance applications. Treating “rare earths” as a single commodity obscures critical distinctions and misdirects resources. True resilience begins with understanding which elements are indispensable, where they are used, and how their unique roles create cascading risks across defense and energy systems.
Light and Heavy Rare Earths Require Different Strategic Approaches
Rare earth magnets are central to modern defense and energy systems, which makes their supply chains critical to U.S. strategic resilience. Understanding how the 17 rare earth elements are divided into light and heavy groups is essential for assessing risk. Light rare earths like cerium and lanthanum are abundant, with cerium more prevalent in the Earth’s crust than copper or lead, often treated as byproducts rather than primary targets. In contrast, heavy rare earth elements (HREEs) are the linchpins of advanced technologies. While neodymium and praseodymium (NdPr), classified as light rare earths, are critical for high-strength permanent magnets in electric vehicles, wind turbines, and drones, it is dysprosium and terbium, true HREEs, that enable these magnets to maintain performance under extreme thermal and mechanical stress. This makes them vital for jet engines and missile guidance systems. When the DoW funds heavy rare earth processing it is targeting the most consequential segment of the supply chain.
NdPr magnets dominate in volume, but HREEs define performance ceilings in mission-critical environments. Without dysprosium and terbium, magnets lose their ability to resist demagnetization at high temperatures, leading to irreversible failure in defense platforms operating under intense heat. This creates a tiered risk structure: NdPr supply can be expanded through scaled separation and alloy production, but HREE availability depends on a narrow set of global sources, primarily in China and Myanmar. Any disruption in HREE supply directly threatens the readiness of fighter jets, directed energy weapons, and other high-heat systems. Recognizing this hierarchy compels a shift from broad supply chain initiatives to targeted interventions where failure would have the greatest operational impact.
The Real Chokepoint Is Processing and Magnet Fabrication, Not Mining
The strategic vulnerability in rare earths lies in the downstream stages of separation, refining, and magnet manufacturing, capabilities the U.S. still lacks despite domestic extraction. Mountain Pass produces rare earth concentrate, but until recently, it was shipped to China for separation, the most technically complex and environmentally sensitive phase. MP Materials is building a rare earth metal, alloy, and magnet facility in Fort Worth, and the DoW is funding a multibillion‑dollar effort to reach 10,000 metric tons of annual magnet capacity by 2028. Yet the U.S. still relies on foreign magnet production. The $400 million equity purchase by the U.S. government in MP Materials, making it the largest shareholder, underscores that this is a national security imperative. Geopolitical disruptions disproportionately affect rare earths, cobalt, and nickel, while lithium and copper show greater resilience, highlighting that the threat is not uniform across critical minerals.
China controls over 85% of global rare earth refining capacity and dominates magnet manufacturing, giving it leverage not just through volume but through technical mastery and process control. The DoW’s investments in E-VAC and MP Materials aim to close this gap by establishing end-to-end domestic production, from concentrate to finished magnets. Until this chain is complete, the U.S. cannot guarantee access to the components that power its most advanced defense and energy systems. The distinction between mining and processing helps define where strategic risk accumulates and where intervention must be focused.
Risk Prioritization Must Account for Substitutability, Recyclability, and Mission Impact
Traditional supply chain assessments based on volume and import dependence fail to capture the full risk profile of rare earth elements. TTI’s Risk Prioritization and Mitigation (RPM) methodology provides a more precise framework by intersecting threat, vulnerability, and strategic objectives. Under RPM, dysprosium ranks extremely high because it has no viable substitute in high-temperature magnet applications, is poorly recycled in current defense systems, and directly affects platform survivability. In contrast, lanthanum, though widely used in catalytic converters, scores lower due to available alternatives and limited mission-critical impact. RPM ranks materials and generates tailored risk mitigations based on each element’s risk profile.
For NdPr, risk mitigations include accelerating domestic magnet production and expanding separation capacity. For HREEs, strategies involve securing alternative sources through international partnerships and advancing urban mining, recovering rare earths from end-of-life electronics and defense hardware. RPM shifts the focus from reactive stockpiling to proactive system design, forcing decision-makers to consider not just supply sources but the consequences of unavailability. In defense contexts, magnet failure can lead to delays, mission aborts or platform loss. By mapping each element to specific functions and failure modes, RPM identifies high-leverage points where targeted investment yields disproportionate security returns.
Turning Vulnerability into Strategic Advantage Through Innovation and Alignment
The path forward is to mitigate risk and transform vulnerability into strategic advantage through TTI’s Opportunity Analysis (OA), shifting our posture from defense to offense. OA treats the rare earth challenge as a wicked challenge, interconnected across technology, geopolitics, and industrial policy, with stakeholders spanning the DoW, DOE, private sector, and allied nations. Instead of only replicating existing supply chains, the U.S. can compete where China’s incumbency counts for less. Rare-earth-free magnets are moving from lab to factory, with American-made iron nitride magnets shipping to customers this year. Pair that design push with closed-loop recycling and coordination with allies who control complementary resources. The DoW’s recent investments are a necessary start, but they must be guided by disciplined risk and opportunity insights. To move beyond vulnerability to strategic advantage, organizations can apply RPM to identify what truly matters and use OA to build the future. Contact Tier Tech International to initiate a Risk Prioritization and Mitigation assessment tailored to your mission-critical supply chains.
This post is part of an ongoing series on U.S. critical minerals strategy and national security.
Read Post # 1: Time for a Smarter Framework
