Backchaining Loss of Control Mitigations from Mission-Specific Benchmarks in National Security
Affordances and permissions are promising and timely safety levers for mitigating Loss of Control (LoC) threats in high-stakes deployment contexts, such as national security. Deployers in defense and intelligence could rely on several approaches to identify which affordances and permissions should be prioritized, such as structured threat modelling, pre-deployment agentic evaluations, post-deployment continuous monitoring, and AI safety cases. This paper proposes a complementary and empirical methodology that leverages existing use-case-specific benchmarks: backchaining LoC mitigations from the errors an AI system makes on national security benchmarks. The approach proceeds in three steps and allows national security deployers to start building LoC mitigations today, from evidence they can generate themselves. First, deployers evaluate AI systems on mission-specific benchmarks approximating real use-cases. Second, deployers concentrate on the incorrect responses that the AI system provides to the benchmark questions, and backchain the affordances and permissions that would enable the AI system to cause downstream harm if it pursued the actions described in the incorrect answers. Third, deployers intervene selectively on those affordances and permissions, bottlenecking the paths to harm while preserving the AI system's ability to carry out the correct action. We illustrate this methodology through a demonstrative benchmark question on derivative security classification.