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Purpose The production and supply capacity of the Swedish defense industry under pressure remains relatively underexplored. However, increasing demand for defense equipment has raised concerns about industry supply chains' robustness and delivery capabilities. This study aims to analyze the robustness and resilience of the value networks in the Swedish defence sector for prolonged crises scenarios. Methodology This study introduces a sociotechnical viability framework to conceptualize supply chain resilience through the using scenario analysis. The framework is informed by complex adaptive systems (CAS) principles, and data are collected from interviews and workshops conducted with four case organizations. System deficiencies were identified using stress tests as an evaluative tool. Findings Findings highlight the urgent need to balance resilience and robustness resilient within defence industry processes, especially amid geopolitical instability and rising security demands. This study enhances our understanding of complexity within defense industry processes by identifying key internal and external constraints. Practical implications The research highlights the importance of proactive risk management, stakeholder collaboration, and trust-building between public and private actors. The application of stress tests offers a practical means to uncover vulnerabilities and design strategies to enhance the robustness and adaptability of supply chains.