This paper examines the dual-use challenges of foundation models and the consequent risks they pose for international security. As artificial intelligence (AI) models are increasingly tested and deployed across both civilian and military sectors, distinguishing between these uses becomes more complex, potentially leading to misunderstandings and unintended escalations among states. The broad capabilities of foundation models lower the cost of repurposing civilian models for military uses, making it difficult to discern another state's intentions behind developing and deploying these models. As military capabilities are increasingly augmented by AI, this discernment is crucial in evaluating the extent to which a state poses a military threat. Consequently, the ability to distinguish between military and civilian applications of these models is key to averting potential military escalations. T