Uncertainty shapes the world for decisionmakers and their supporting intelligence officials. There is much written about the relation between political decisionmakers and the larger intelligence agencies. But most decisionmakers that are handling uncertainty are not politicians and they are not supported by specific intelligence agencies. This essay focus on the military decisionmakers and their “in-house” intelligence officers.The concept of epistemic communities is in this study used in a case study of Swedish military decisionmakers and intelligence officials to better understand the interaction between them. The concept sheds light on the importance of how perceptions of uncertainty and views of knowledge shapes communities and creates differences in norms and culture. The differences between decisionmakers and intelligence officers in turn affects their cooperation and could increase the risk of faulty decision making and surprise.