Decision researchers describe a “prominence effect” that leads decision makers to choose an option with more defensible attributes when quantitative assessment of those options is difficult. Prominence is hypothesized as a factor in US policy decisions not to use military force to prevent or stop humanitarian crises. Prominence is also regarded as a behavioral failure affecting both the general public and public officials that can be mitigated to improve welfare outcomes in transnational security decisions. This article—by David G. Delaney and Paul Slovic—considers those hypotheses as they relate to attorneys advising the US president and other senior public officials addressing transnational security issues. It proposes a combination of institutional, organizational, and individual steps to mitigate prominence and related behavioral failures.