In my experience, veterans of combat and those involved in early public safety followed the rules, but they also identified when a rule didn’t apply, particularly in an environment with uncertainty, time pressure and grave threat. Combat and public safety veterans approached knowledge-based error situations differently, because evidence-based approaches would not, nor could not, work. When uncertainty existed in a situation, these veterans would focus on a shared objective and problem solve with the resources at hand, requesting additional aid but accepting the fact that one could not delay problem solving.